On an NIS client, the following is a portion of the output of cat /etc/passwd:
+Joe:::::::
+Sam:::::::
+:*::::::::/bin/false

Which of the following is true for all users other than Joe and Sam?

A.
They are denied access.

B.
They gain access after being prompted for a shell.

C.
They are granted limited access.

D.
They have full access.