What is a prerequisite for deploying Smart DR?

What is a prerequisite for deploying Smart DR?
A . Requires one-to-many shares.
B . The Files Manager must have at least three file servers.
C . The primary and recovery file servers must have the same domain name.
D . Open TCP port 7515 on all client network IPs (uni-directionally on the source and recovery file servers).

Answer: D

Explanation:

Smart DR is a feature that allows share-level replication between active file server instances for disaster recovery. To configure Smart DR, one of the prerequisites is to open TCP port 7515 on all client network IPs (uni-directionally on the source and recovery file servers). This port is used for communication between the FSVMs and the replication engine.

Reference: Nutanix Files Administration Guide, page 79; Nutanix Files Solution Guide, page 9