單項選擇題

局域網(wǎng)中某主機的IP地址為172.16.1.12/20,該局域網(wǎng)的子網(wǎng)掩碼為()

A.255.255.255.0
B.255.255.254.0
C.255.255.252.0
D.255.255.240.0

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