Which of the following is helpful to allow an IPv6 host to learn the IP address of a default
gateway on its subnet?

A.
Stateful DHCP

B.
Stateless RS

C.
Stateless autoconfiguration

D.
Neighbor Discovery Protocol

Explanation:
Stateless autoconfiguration only helps a host learn and form its own IP address, but it does
not help the host learn a default gateway. Stateless RS is not a valid term or feature.
Neighbor Discovery Protocol (NDP) is used for several purposes, including the same
purpose as ARP in IPv4, plus to learn configuration parameters such as a default gateway IP
address.