Which two steps should you perform to resolve this problem?

Your Database as a Service (DBaaS) instance hosts a multitenant container database (CDB) with four pluggable database (PDB) tenants.
Users of an application in one PDB and users of another application in another PDB complain of poor performance.
Investigation shows that the application sessions are not using excessive CPU nor are they requesting an unusual amount of I/O.
Which two steps should you perform to resolve this problem?

A.
Add storage to the DBaaS instance.

B.
Add CPU to the DBaaS instance.

C.
Examine the shares of resources allocated to each PDB within the CDB.

D.
Examine the shares of resources allocated to each consumer group within all four PDBs.

E.
Examine the shares of resources allocated to each consumer group within the PDBs that contain the two applications.

F.
Add memory to the DBaaS instance.