Which two statements about multitenant architecture are true?

Which two statements about multitenant architecture are true?

A.
Multiple PDBs on a single server need multiple database instances and multiple sets of
database files.

B.
Although consolidated into a single physical database, PDBs mimic the behavior of non-CDBs.

C.
A PDB administrator can use Oracle Flashback or point-in-time recovery to retrieve lost data
from a PDB, only by shutting down all the PDBs from the CDB.

D.
It is easier to collect performance metrics for many databases in a CDB than individual nonCDB databases.

E.
It takes more time to apply a patch to one CDB that holds hundreds of PDBs than to hundreds
of non-CDB databases.