（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_PLAN. You decided to activate DAY_PLAN by executing the following statement： SQL>ALTER SYSTEM SET RESOURCE_MANAGER_PLAN = ’managers_plan’； What will be the outcome of this statement？（）
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.
正确答案
答案解析
略
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