單項選擇題

請把默認掩碼是255.255.255.0的五個C類網(wǎng):210.1.170.0,210.1.171.0,210.1.172.0,210.1.173.0,210.1.174.0,集成到一個網(wǎng)中,它們的掩碼是多少?()

A.255.255.240.0
B.255.255.255.240
C.255.255.255.224
D.255.255.248.0

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