单选题Which header or set of headers does CRTP compress？ （）ALayer 2BLayer 3CLayer 4DLayer 2 and Layer 3ELayer 3 and Layer 4
单选题
Which header or set of headers does CRTP compress？ （）
A
Layer 2
B
Layer 3
C
Layer 4
D
Layer 2 and Layer 3
E
Layer 3 and Layer 4
参考解析
解析：
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