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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