You want to make the directory /local available via NFS. Everything works fine, but on the client
machine, the super user is unable to read any files on the NFS-mounted file system. Why?

A.
The NFS protocol does not allow this.

B.
The super user has different user IDs on the client and the server machine.

C.
The client, when mounting the NFS filesystem, must specify the option trusted.

D.
The exports entry on the server machine does not include the option no_root_squash.