Oracle Database 12c Advance Adminstration1z0-063 Test 4

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RMAN> CONFIGURE DEFAULT DEVICE TYPE TO disk; 
  RMAN> CONFIGURE DEVICE TYPE disk PARALLELISM 2; 
 RMAN> CONFIGURE CHANNEL 1 DEVICE TYPE DISK FORMAT ‘/disk1/%U’; 
 RMAN> CONFIGURE CHANNEL 2 DEVICE TYPE DISK FORMAT ‘/disk2/%U’; 
 RMAN> BACKUP DATABASE;

Which statement is true about the backup set created by the BACKUP command?

The default channel is allocated and the backup set is created in only one destination.
Two channels are allocated and a copy of the backup set is taken in the location specified by CHANNEL 2.
Two channels are allocated and backup pieces for the backup set are created in both the specified destinations.
Two channels are allocated and two copies of the backup set are taken in parallel in both locations.

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