Which of the following descriptions about  GRE  are correct  ?  ( Choose one or more )

Which of the following descriptions about  GRE  are correct  ?  ( Choose one or more )
A . bearing carrier  IP  header to  UDP  port number  47  identifies the  GRE  header
B . GRE  uses the Ethernet protocol type  Ox0800 to  identify the payload packet as  IP
C . GRE VPN  can transmit multicast data
D . adopted using  IP over IP  of  GRE  encapsulation, public network and the private network interface address may coincide

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Answer:   BC