单选题Which statement is true while creating subplans using Resource Manager？（）A The subplan must belong to the consumer group， SYS_GROUP.B The total CPU usage at any given level must be less than 100%.C The subplans can be used to restrict the degree of parallelism for a user.D You can use a resource plan instead of a consumer group to implement a priority ranking within the plan.
单选题
Which statement is true while creating subplans using Resource Manager？（）
A
The subplan must belong to the consumer group， SYS_GROUP.
B
The total CPU usage at any given level must be less than 100%.
C
The subplans can be used to restrict the degree of parallelism for a user.
D
You can use a resource plan instead of a consumer group to implement a priority ranking within the plan.
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