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【单选题】

Within a resource-plan definition, what differentiates a top-level plan from a subplan?()

A、A subplan has the PLAN_SUB parameter value set to SUB

B、A top-level plan has the GROUP_OR_PLAN parameter set to the name of the subplan in the resource-plan definition

C、There is no difference in the resource-plan definition

D、A subplan always has the CPU_MTH parameter value set to RATIO

E、The string TOP_LEVEL is appended to the name of top-level resource plans

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