Examine the RMAN command: RMAN> BACKUP VALIDATE DATABASE; Which statement is true about the execution of the command? 

Answer options:

A. Block change tracking must be enabled before executing this command.
B. The database must be running in archivelog mode for the successful execution of this command.
C. A complete database backup must exist before executing this command.
D. The command checks for blocks containing all zeros, an invalid checksum, or a corrupt block header.
E. The command checks for blocks that contain a valid checksum and matching headers and footers, but that has logically inconsistent contents.

D