IPv6 addresses are 128-bit hexadecimal addresses. Therefore, letters such as “G” and “H” contained in the second and third answers are invalid. The fourth answer contains two semi-columns “::”, which is also invalid, as the semi-column can only be used once in an IPv6 address.
More information on IPv6 can be found on Firewall. cx’s analysis of IPv6 Protocol structure and IPv6 subnetting.
Discuss about the question