题目内容（请给出正确答案）

[主观题]

A national retail chain needs to design an IP addressing scheme to support a nationwide ne

twork. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme？（）

A.255.255.255.0

B.255.255.255.128

C.255.255.252.0

D.255.255.255.224

E.255.255.255.192

F.255.255.248.0

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