What should the administrator do before restoring the data?

A Dell EMC NetWorker administrator has been performing federated backups of their Microsoft SharePoint farm. After a problem with the farm, the administrator needs to perform a full restore.

What should the administrator do before restoring the data?
A . Re-add the database using the “join-only” option
B . Unmount any previous SharePoint GLR backups.
C . Install the Agent for Content Transfer Services
D . Delete the secondary replica databases

Answer: B