When an IPv6 enabled host boots, it sends a router solicitation (RS) message. An IPv6 router responds with a router advertisement (RA). Which two items are c ontained in the RA?（）

• A、any route advertisements it has received
• B、prefixes for the link
• C、keepalive timers
• D、IPv6 address for the host
• E、request for the local host IP address
• F、lifetime of the prefix