单项选择题
Which of the following is an invalid subnet mask?（）
A.255.0.0.0
B.255.256.255.0
C.255.255.255.255
D.255.255.00
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An administrator is configuring IP 10.178.1.5 on a legacy device that will only accept a classfuladdress. Which of the following is the address that can be used in this scenario?（）
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