Which three statements are true regarding multitenant architecture for RAC databases? 

Answer options:

A. One UNDO tablespace for each PDB is required.
B. One UNDO tablespace for each instance is required.
C. PDBs can have local temporary tablespaces.
D. All the containers share the same SYSTEM and SYSAUX tablespaces.
E. You can open one, several, or all PDBs on one, several, or all CDB instances.

BCE

B: For an Oracle RAC CDB, one active undo tablespace exists for each instance. C: From a physical perspective, a CDB has basically the same structure as a non-CDB, except that each PDB has its own set of tablespaces (including its own SYSTEM and SYSAUX tablespaces) and data files. References: https://docs.oracle.com/database/121/CNCPT/cdblogic.htm#CNCPT89268