A project you are part of as a Solutions Architect has a latency-sensitive workload requirement despite availability. You have to consider building high-performance networking for their VPCs to operate based on SLAs already signed as part of the contract. Which two statements in this context are correct? (Select TWO)

Answer options:

A.A cluster placement group is appropriate for this use case as long as the grouping of instances stays within a single Availability Zone unless using peered VPCs to span multiple regions.
B.A cluster placement group is appropriate for this use case because of a higher per-flow throughput limit of up to 10 Gbps except for the traffic over an AWS Direct Connect connection to on-premises resources.
C.You can migrate an instance from one placement group to another but cannot merge placement groups.
D.You can migrate an instance from one placement group to another and merge placement groups.
E.A spread placement group is appropriate for this use case but if you start or launch an instance in the group and there is insufficient unique hardware, the request fails and you have to try again.

Answers: B, C
A cluster placement group is the only one providing high-performance networking. It is also possible to migrate instances between placement groups, but merging placement groups is not supported.
Option A is incorrect because cluster placement groups cannot span multiple regions.
Option D is incorrect because you cannot merge placement groups.
Option E is incorrect because a spread placement group is more appropriate for availability scenarios. 
References:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html