Which of the following does this file indicate?

The system administrator notices the following file in a user’s home directory:
-rwsr-xr-x 1 root user1 628684 Jun 13 09:38 ksh

Which of the following does this file indicate?

A.
The system has been compromised.

B.
Only root has shared access for ksh.

C.
ksh was inadvertently installed in user’s directory.

D.
The ksh service needs to be restarted.