Cloud Service Consumer A accesses Cloud Service A (1) that resides in Cloud X.
a private cloud owned by the same organization acting as Cloud Consumer A.
Cloud Service A processes the message from Cloud Service Consumer A and then sends back a response
with the requested data (2). Next, Cloud Service Consumer A sends a message containing
some of this data to Cloud Service B (3), which resides in public Cloud Y that is owned by
Cloud Provider Y.
After processing the message, Cloud Service B sends back a response
with additional data to Cloud Service Consumer A (4). Finally, Cloud Service Consumer A
writes the data it collected from Cloud Services A and B to Database A (5).

Recently, Cloud Service Consumer A has been required to access Cloud Services A and B
at a significantly higher rate, sometimes over 1,000 times within a given workday. This
increased usage has not affected Cloud Service B's performance. Cloud Service A,
however, has been generating runtime exceptions and responses to Cloud Service
Consumer A have become increasingly slow and unreliable. It is determined that this
decline in performance is due to infrastructure limitations within private Cloud X's
environment. Instead of investing in new infrastructure for Cloud X, it is decided to explore
the feasibility of moving Cloud Service A to Cloud Y instead.
Which of the following statements describe valid financial considerations that can be taken
into account for assessing the feasibility of this move?

• A. Once Cloud Service A is deployed in Cloud Y, it may form dependencies upon
  proprietary parts of Cloud Y that may limit its mobility should it be decided to move it
  outside of Cloud Y in the future. This can incur further locked-in costs that need to be
  accounted for.
• B. By moving Cloud Service A to Cloud Y, the SaaS delivery model will be established for
  Cloud Service A, thereby allowing the service implementation to build upon existing
  infrastructure from underlying PaaS and laaS delivery models that would have been
  required for Cloud Service B to be implemented in Cloud Y.
• C. Moving Cloud Service A to Cloud Y will require that Database A also be moved to Cloud
  Y due to the need for Cloud Service A and Database A to share a common virtual server
  within the same organizational boundary, as required by the cloud-based security group.
  The move of Database A will increase the integration testing effort and. as a result, will also
  increase the overall integration costs.
• D. Public Cloud Y charges for the use of its IT resources. Moving Cloud Service A to Cloud
  Y can therefore result in new on-going costs. Although Cloud Service A may be able to
  share some of the existing IT resources used by Cloud Service B, it will likely incur new on-
  going costs that need to be budgeted for.

Cloud Service Consumer A invokes Cloud Service A from Cloud X (owned by Cloud
Provider X) (1). To fulfill the request from Cloud Service Consumer A, Cloud Service A
needs to invoke Cloud Service B that resides on Cloud Y (owned by Cloud Provider Y) (2).
After completing its processing, Cloud Service B sends a response to Cloud Service A (3).
Cloud Service A verifies the response and then finally sends its response to Cloud Service
Consumer A (4).

The guaranteed availability of the Cloud Service A implementation is 95% and the
guaranteed availability of the Cloud Service B implementation is 95%. Which of the
following statements accurately describes the actual availability that Cloud Service
Consumer A can receive based on the described scenario?

• A. Cloud Service Consumer A benefits from redundant cloud service implementations,
  thereby increasing the guaranteed availability as follows:
  1 - (1 - (0.95 - 0.1)) X (1 - (0.95 - 0.1)) = 0.9775 or 97.75%
• B. Because Cloud Service Consumer A's response message is processed by two separate
  cloud services, the combined availability increases as follows:
  1 - (1 - 0.95) X (1 - 0.95) = 0.9975 or 99.75%
• C. As a result of the dependency formed by Cloud Service Aon Cloud Service B, the
  combined availability decreases significantly as follows:
  (0.95 X 0.95) - 0.1 = 0.8025 or 80.25%
• D. Because Cloud Service A acts as both a cloud service and cloud service consumer in
  order to process Cloud Service Consumer B's request message, Cloud Service A forms a
  dependency on Cloud Service B.
  As a result, the combined availability decreases, as follows:
  0.95 X 0.95 = 0.9025 or 90.25%