Identify three scenarios in which RMAN will use backup sets to perform active database duplication.

when the duplicate ... from active database command contains the section size clause

when you perform active database duplication on a database with flashback disabled

when you specify set encryption before the duplicate ... from active database command

when the number of auxiliary channels allocated is equal to or greater than the number of target channels

when you perform active database duplication on a database that has readonly tablespaces