Which NetApp feature provides WORM functionality at the volume level?

n = SnapLock is a NetApp feature that provides WORM (write once, read many) functionality at the volume level. WORM storage enables you to retain files in unmodified form for a specified retention period. SnapLock protects WORM files at the file level and prevents them from being modified, even after the retention period has expired. SnapLock is powered by a tamper-proof clock that determines when the retention period for a WORM file has elapsed. SnapLock is available for Cloud Volumes ONTAP systems and supports both NFS and CIFS protocols. References = WORM storage | NetApp Documentation, WORM storage - NetApp