The correct prerequisites are to enable granular recovery in the policy and ensure Network File System (NFS) is enabled/installed on the Active Directory client. Cohesity NetBackup documentation states that an Active Directory backup policy can be configured to allow restore of "objects and attributes" and that, in the policy Attributes tab, the administrator must select MS-Windows as the policy type and then Enable the Enable granular recovery option; if it is not enabled, the backup can run, but it cannot produce granular restores.
Cohesity also defines the system requirement for Active Directory granular backup and recovery: NFS must be installed on the media server and all Active Directory domain controllers or ADAM/LDS hosts. This matches option E because the Active Directory domain controller is the NetBackup client in this workflow.
Option C is incorrect because NBFSD is not installed as a client prerequisite; the client mounts a mapped drive, while the media server handles requests through the NBFS/NBFSD service. Option B is wrong because the documented policy type is MS-Windows, not FlashBackup-Windows. References/topics: Active Directory granular backups and recovery, GRT, NFS configuration, and Creating a policy that allows Active Directory granular restores.