Which of the following do you have to use to remove a pending job for the at command?

You discover a pending job for the at command.

Which of the following do you have to use to remove it?

A.
atrm

B.
atq -r

C.
at -r

D.
rmat

Explanation/Reference:
From the man pages:
atrm    deletes jobs, identified by their job number.