A. A multi-tenant standby database can have fewer pluggable databases than the primary container database.

B. The Data Guard broker automatically always opens the pluggable databases of a standby database after a role change operation.

C. The CDBDBA privilege must be used instead of the SYSDBA privilege for connections as SYS to the root container of a multi-tenant standby database.

D. The Data Guard broker automatically opens all pluggable databases of a primary database after a role change operation.

E. Different pluggable databases within a logical standby database may have different guard statuses.