【单选题】The Database Resource Manager is not currently active in your database that is up and running. You created a resource plan named DAY_PLAN that contains two sub-plans named MANAGERS_PLAN and CLERKS_PLA...
A.
The statement will deactivate DAY_PLAN.
B.
The statement will activate DAY_PLAN as the top plan.
C.
The statement will activate MANAGERS_PLAN as the top plan.
D.
The statement will return an error because MANAGERS_PLAN is not the top plan.