Using Oracle Scheduler you have scheduled two jobs, JOB_A and JOB_B, to run at 9:00 p.m. every Friday. You want both the jobs to use a single resource plan, WEEKEND_PLAN. Which task must have already been performed to enable you to achieve this objective?()
A、A. A window must have been created with the WEEKEND_PLAN resource plan.
B、B. A program must have been created with the WEEKEND_PLAN resource plan.
C、C. A job class must have been created with the WEEKEND_PLAN resource plan.
D、D. A windows group must have been created with the WEEKEND_PLAN resource plan.