You execute the following block of code:   SQL>BEGIN   DBMS_RESOURCE_MANAGER.CREATE_SIMPLE_PLAN   ( SIMPLE_PLAN => ’DEPARTMENTS’,   CONSUMER_GROUP1 => ’PAYROLLL’,   GROUP1_CPU => 50,   CONSUMER_GROUP2 => ’SALES’,   GROUP2_CPU => 25,   CONSUMER_GROUP3 => ’MARKETING’,   GROUP3_CPU => 25);   END;   SQL>/   What is a prerequisite for using the simple resource plan created by executing the above code?()
A: You must assign users to consumer groups.
B: You must grant the switch privilege to the users.
C: You must create a resource plan directive.
D: You must specify the complex resource plan.
出自:Oracle认证