Which three options can you use to accomplishthe task?

You have Oracle Database 10g instance on a Linux machine. You want to schedule the RMAN
backup of your database everyday at 7:00 p.m. Which three options can you use to accomplish
the task? (Choose three.)

A.
DB Console

B.
The at OS command

C.
The batch OS command

D.
The crontab OS command

E.
Oracle Enterprise Manager Grid Control