单选题Which statement is true regarding the creation of nested plans using Resource Manager？（）A Only one nested subplan is allowed.B The plans can be nested up to four levels.C Resource Manager does not support nested plans.D Nested plans control only the degree of parallelism but not the CPU.E Each nested plan gets a proportion of the CPU resources assigned to its parent group.
单选题
Which statement is true regarding the creation of nested plans using Resource Manager？（）
A
Only one nested subplan is allowed.
B
The plans can be nested up to four levels.
C
Resource Manager does not support nested plans.
D
Nested plans control only the degree of parallelism but not the CPU.
E
Each nested plan gets a proportion of the CPU resources assigned to its parent group.
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