Which tool does not require the system to be running continuously to schedule jobs on the Linux AS machine?

LMN International is a leading airline operating across the globe. The resources include a Linux AS machine that is brought online during emergencies or when the primary server is taken offline.
Which tool does not require the system to be running continuously to schedule jobs on the Linux AS machine?

A.
atd

B.
cron

C.
systat

D.
anacron