What does the Session Border Controller do when the Adaptive Hosted NAT (HNT) feature is enabled?

A: It sends a periodic re-register command to each endpoint behind a NAT. B: It creates a binding for the Address of Record (AOR) of an endpoint that is behind a NAT. C: It creates a binding for the Address of Record (AOR) of an endpoint that is NOT behind a NAT. D: It sends SIP OPTIONS at increasing intervals to test if an endpoint behind a NAT device is still reachable. E: It sends ICMP PNGs to dynamically learn the binding time of an endpoint behind a NAT device.