Where is the metadata for the backup sets contained?

Where is the metadata for the backup sets contained?

A. in the …Backup Exec\Catalogs directory

B. in the …Backup Exec\Data directory
C. in the Backup Exec Database
D. in the HKLM\SOFTWARE\Veritas\Backup Exec registry key

Reference: https://www.veritas.com/support/en_US/article.100042698