Which three are true concerning restoring of RMAN backu…

Which three are true concerning restoring of RMAN backups to primary and physical standby databases in a
Data Guard environment?

A.
Backups of data files taken on the primary database may be restored on a physical standby database.

B.
Backups of control files taken on the primary database may not be restored and used on a physical standby
database.

C.
Backups of SPFILEs taken on a physical standby database may not be restored on the primary database.

D.
Backups of control files taken on a physical standby database may be restored on the primary database.

E.
Backups of data files taken on a physical standby database may be restored on a primary database.

F.
Backups of SPFILEs taken on the primary database may not be restored and used on a physical standby
database.

Explanation:
C, F: All backup operations can be offloaded to a single standby database, except backups of the SPFILE.
Backups of the SPFILE can only be restored to the database from which they were backed up.
E: RMAN restores database files, over the network, from a physical standby database.
As of Oracle Database 12c, RMAN lets you restore or recover files by connecting, over the network, to a
physical standby database that contains the required files. You can restore an entire database, data files,
control files, spfile, or tablespaces.
Note: An Oracle database consists of one or more logical storage units called tablespaces, which collectively
store all of the database’s data. Each tablespace in an Oracle database consists of one or more files calleddatafiles, which are physical structures that conform to the operating system in which Oracle is running.
https://docs.oracle.com/database/121/SBYDB/rman.htm#SBYDB00755