What may be the cause for the failure?

An administrator has a job that has failed. See the contents of the Job’s Detailed Status tab from the NetBackup Activity Monitor provided below:

What may be the cause for the failure?
A . The version of NetBackup installed on the master server and media server is higher than the version installed on the client.
B. The media server is unable to resolve the hostname of the client to any IP address.
C. The required NetBackup processes need to be started on the client.
D. The media server failed to perform a reverse name lookup of the IP address associated with the client.

Answer: C