Which of the following is the MOST likely cause of this error?

The root user receives a ‘Permission denied’ error message when trying to write files to an NFS (Network File System) mounted directory. Which of the following is the MOST likely cause of this error?

A.
The server share needs to specify no_root_squash.

B.
The server is not allowing the client to connect.

C.
The server needs to allow NFS UDP packets.

D.
The directory needs to be remounted as NFSv3.