单项选择题

WhendividinganexistingClassBnetworkinto2subnetsof32，766……

When dividing an existing Class B network into 2 subnets of 32，766 hosts each， which of the following subnet masks should be used？（）

A.128.0.0.0
B.255.128.0.0
C.255.254.0.0
D.255.255.128.0

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