What are the DNS requirements for the Internet DMZ facing relay?

A.
The Internet DMZ relay must have a host record present in DNS.

B.
The Internet DMZ relay must have both host and PTR records present in DNS.

C.
The Internet DMZ relay does not require a DNS record if used with the task – BES Client
Setting: Name Override.

D.
The Internet DMZ relay does not require a DNS record if used with the task – BES Relay
Setting: Name Override.