单项选择题

下列有关计数的历史发展按时间先后排序正确的是()

A.手指计数→结绳记数→刻痕记数→石子记数
B.手指计数→结绳记数→石子记数→刻痕记数→刻痕记数→手指计数
C.手指计数→石子记数→结绳记数→刻痕记数
D.石子记数→结绳记数→刻痕记数→手指计数

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A.
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如果借用一个C类IP地址的3位主机号部分划分子网，那么子网掩码应该是()
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