You want to kill the dtmail process that is hanging. Which command can you use to achieve this?

A.
pkill dtmail

B.
kill 9 mail

C.
pkill 1 mail

D.
kill 9 dtmail

Explanation:

The kill command requires a process ID (PID) and the pkill command requires a process name. The command kill 9 dtmail will not work because a process name is specified instead of the process ID.