單項選擇題

請根據(jù)下面的CIDR寫法，寫出其子網(wǎng)掩碼和網(wǎng)絡(luò)ID（）131.107.31.126/28

A.255.255.255.224131.107.31.128
B.255.255.255.240131.107.3.0
C.255.255.255.248131.107.3.64
D.255.255.255.240131.107.3.112

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