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