How many database instances are used during a database-duplication process？（）

Which of the following commands will perform an active database duplication of the ORCL database to the ORCL2 database？（）

A.A
B.B
C.C
D.D
E.E

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Whenyoureperformingactivedatabaseduplication，abackupofwhatkindisrequired？（）

A. A current RMAN backup-set backup is required.
B. No backup is required.
C. An RMAN image backup is required.
D. A manual backup is required.
E. A "duplicate" preparatory backup is required.

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