Which two statements about IPv6 router advertisement messages are true? (Choose two.)

A.
They use ICMPv6 type 134.

B.
The advertised prefix length must be 64 bits.

C.
The advertised prefix length must be 48 bits.

D.
They are sourced from the configured IPv6 interface address.

E.
Their destination is always the link-local address of the neighboring node.