This is a tricky question because Huawei allows 7 bits for subnetting. Anyway, I guess the answer should be A.
https://support.huawei.com/enterprise/br/doc/EDOC1100058917/5952bfa4/example-for-configuring-an-ip-address-with-a-31-bit-mask
SORRY - I ready the question wrongly Answer B is wrong. The correct answer is A. Answer B is right for the maximum number of host bits which is: 2^8-2 = 254
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