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

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.

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Answer: AB