Which three steps must be taken to resolve the problem?

A vCenter Operations Manager 5.7 environment is upgraded to vRealize Operations. After the upgrade, the analytics services fail to start.
Which three steps must be taken to resolve the problem? (Choose three.)

A.
Take the vRealize Operations cluster offline.

B.
Delete the activity persistence files.

C.
Bring the cluster back online.

D.
Remove any unresponsive nodes.

E.
Stop the CaSA service.

Explanation:
If the analytics failed to start, take the vRealize operations cluster offline, delete activity persistence files and bring the cluster back online to start the failed services.
https://www.vmware.com/support/vrops/doc/vrops-601-release-notes.html