【多选题】
A Pre-existing backups of the database to be duplicated are required for the "push" method ofduplication.
B Pre-existing backups of the database to be duplicated are required for the "pull" method ofduplication.
C Pre-existing backups of the database to be duplicated are always used if they exist.
D Image copies can be used to duplicate the active database.
E The active database must be duplicated while in OPEN state.
F No connection to the recovery catalog is required for active database duplication.
G Backup sets can be used to duplicate the active database.
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