Identify three scenarios in which RMAN will use backup sets to perform active database duplication.
A.when the duplicate ... from active database command contains the section size clause B.when you perform active database duplication on a database with flashback disabled C.when you specify set encryption before the duplicate ... from active database command D.when the number of auxiliary channels allocated is equal to or greater than the number of target channels E.when you perform active database duplication on a database that has readonly tablespaces正确答案ACD
