An Administrator Needs to Kill the Oldest Bash Shell Running

Multiple Choice

An administrator needs to kill the oldest Bash shell running in the system. Which of the following commands should be issued to accomplish this task?

A) ps axjf | grep bash to obtain PID kill -9 PID
B) ps -eo pid,etime,cmd | grep bash (to obtain PID)
C) ps -eo pid,etime| grep bash (to obtain PID) killall -9 PID
D) killall -15 -o bash