After you selected Incremental mode in the job settings, how do you ensure the forever forward incremental
backup mode is configured?

A.
Check the “Use Forever Forward Incremental” box

B.
Enable synthetic full backups and/or active full backups

C.
Disable synthetic full backups and active full backups

D.
Enable“Transform previous backup chains into rollbacks”box

Explanation:
https://helpcenter.veeam.com/backup/vsphere/incremental_forever_backup.html