单选题What are the header sizes for point-to-point and multi-point GRE(also known asmGRE) with tunnel key?()A 4 bytes for bothB 4 bytes, and 8 bytes respectivelyC 8 bytes for bothD 24 bytes for both

单选题
What are the header sizes for point-to-point and multi-point GRE(also known asmGRE) with tunnel key?()
A

 4 bytes for both

B

 4 bytes, and 8 bytes respectively

C

 8 bytes for both

D

 24 bytes for both


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