Which two are prerequisites for creating a backup-based duplicate database?

A.
connecting to the target database and a recovery catalog to execute the duplicate
command

B.
creating a password file for an auxiliary instance

C.
connecting to an auxiliary instance

D.
matching the database identifier (DBID) of the source database and the duplicate
database

E.
creating an SPFILE for the target database

Explanation:
Reference:
http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta020.htm#CHDEDFFH