You have successfully taken a database backup by using the command: RMAN> BACKUP AS BACKUPSET DATABASE; Now you execute this command: RMAN> BACKUP INCREMENTAL LEVEL 1 DATABASE; What is the outcome? 

Answer options:

A. It fails because an incremental level 1 backup always searches for an image copy as level 0 backup.
B. It fails because an incremental level 0 backup does not exist.
C. It takes a backup of blocks that have been formatted since the last full database backup.
D. It takes an incremental level 0 backup of the database.
E. It first takes an incremental level 0 backup and then an incremental level 1 backup.

E

References: https://docs.oracle.com/cd/B19306_01/backup.102/b14192/bkup004.htm (4.4.1.2)