Your database is configured in ARCHIVELOG mode. Examine the RMAN configuration parameters: 

Examine the command: RMAN> BACKUP DATABASE PLUS ARCHIVELOG DELETE INPUT; What is the outcome? 

Answer options:

A. It fails because the DELETE INPUT option can be used only with the BACKUP AS BACKUPSET command.
B. It executes successfully and creates a backup set of the database along with archived log files and then deletes the original archived log files.
C. It executes successfully and creates an image copy of the database along with archive log files and then deletes the original archived log files.
D. It fails because the DELETE INPUT option can be used only with the BACKUP AS COPY command.

B

References: https://docs.oracle.com/cd/B13789_01/server.101/b10734/rcmbackp.htm