Which two statements about GRE tunnels are true? （ Choose two ）

Which two statements about GRE tunnels are true? （ Choose two ）
A . GRE tunnels operate in GRE/IPsec mode by default
B . GRE tunnels operate in GRE/IP mode by default
C . GRE encapsulates the original packet
D . The carrier protocol adds the delivery header
E . The IP header encapsulates the GRE header

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Answer: BC