为自己加油

Which three are true about using Database Resource Manager in an

Oracle multitenant environment? (Choose three.)

A.
A PDB-level resource plan can limit session PGA memory.
B.
A CDB-level resource plan can limit PDB CPU utilization.
C.
A CDB-level resource plan can limit session CPU utilization.
D.
PDB-level resource plans can limit uncommitted UNDO per consumer group.
E.A CDB-level resource plan can limit PDB UNDO use.
F.A CDB-level resource plan is mandatory when using PDB-level resource plans.