Not a Valid IPv6 Address Type

E.

All the IPv6 address types mentioned in the question are valid except for the E. broadcast.

Here is a brief explanation of each IPv6 address type:

A. Link-local unicast: These addresses are used for communication within a single subnet and have a scope limited to the local link. The prefix for link-local addresses is FE80::/10.

B. Unique-local unicast: These addresses are similar to the private IPv4 addresses and are used for communication within a private network. The prefix for unique-local addresses is FC00::/7.

C. Anycast: Anycast addresses are used for communication with any one of a group of possible hosts that share the same anycast address. The nearest host with the anycast address is chosen for communication. Anycast addresses are used for load balancing, fault tolerance, and efficient content delivery.

D. Multicast: Multicast addresses are used for communication with a group of hosts that are interested in receiving the same traffic. Multicast addresses begin with the prefix FF00::/8.

E. Broadcast: Broadcast is a communication method that sends data to all hosts on a network. In IPv6, the broadcast address is not used, and multicast is used instead.

Therefore, the correct answer to the question is E. broadcast.