What is the most likely cause of this restore failure?

A customer’s EMC NetWorker environment has a Solaris client that had been backing up without failing for several weeks.

The client has the following local mount points:

/

/usr

/home

/var

And two nfs mount points:

/mars/data1

/jupiter/data1

The save set was identified as "ALL" in the client resource. The client had crashed and was successfully rebooted the previous day. The first request for a restore for this client was submitted for the last night’s backup of /mars/data1/Monthly.doc and /jupiter/data1/Weekly.xls. The jupiter restore is successful but the mars data is not found and fails to be restored.

What is the most likely cause of this restore failure?
A . /mars/data1 was not in the /etc/vfstab file and had not been backed up.
B . The /nsr/res/servers file on mars is empty, prohibiting the restore.
C . The nsrexecd was not running on mars, preventing the backup.
D . The client save set was identified as ALL. ALL does not back up nfs mounts points.