Which subnet mask would be used if 5 host bits are available?

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Question:
Which subnet mask would be used if 5 host bits are available?

255.255.255.0
255.255.255.128
255.255.255.224
255.255.255.240

Explanation: The subnet mask of 255.255.255.0 has 8 host bits. The mask of 255.255.255.128 results in 7 host bits. The mask of 255.255.255.224 has 5 host bits. Finally, 255.255.255.240 represents 4 host bits.

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