Which step should be taken to troubleshoot an existing installation of IBM Tivoli Storage Manager
FastBack (TSM FastBack) Mount/Instant Restore?

A.
Stop and restart the TSMFastBack Manager task

B.
Ensure that the file transfer protocol task is running in the permissive mode

C.
Ensure that the predefined virtual drive has a block size twice that of the mount target

D.
Review the TSMFastBack Mount logs to determine whether the TSM FastBack Mount service
is running