I think answer B is not right because it is mentioned as a requirement for the active database duplication. doc: https://docs.oracle.com/database/121/RCMRF/rcmsynta020.htm#RCMRF126
i agree for this answer. have just done lots of reading on this.
Pre-requisites
Password file from target database.
Sqlnet.ora should have correct parameters.
Target database should be running through pfile or spfile.
Auxiliary instance should be start with pfile in nomount stage.
Answer is AC
"Prerequisites Common to All Forms of Duplication
RMAN must be connected as AUXILIARY to the instance of the duplicate database. The instance of the duplicate database is called the auxiliary instance. The auxiliary instance must be started with the NOMOUNT option."
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