Which three are true about using Database Resource Manager in an Oracle multitenant environment?

PDB-level resource plans can limit uncommitted UNDO per consumer group.

A PDB-level resource plan can limit session PGA memory.

A CDB-level resource plan can limit PDB UNDO use.

A CDB-level resource plan can limit session CPU utilization.

A CDB-level resource plan is mandatory when using PDB-level resource plans.

A CDB-level resource plan can limit PDB CPU utilization