What is the most likely cause of this issue?

A customer is installing a new RecoverPoint environment. All RPAs have been racked, cabled, and powered on. You have chosen to automatically discover the RPAs using Deployment Manager. After running the discovery, no RPAs are found.

What is the most likely cause of this issue?
A . No DHCP server on the network
B . Port 443 not open on the network
C . RecoverPoint/SE wizard selected
D . RPAs not configured into a cluster

Answer: A