单选题 The standard (IEEE 802)format for printing (72) in human-friendly form is six groups of two hexadecimal digits，separated by hyphens(-) or colons(:)，in transmission order, e.g.01-23-45-67-89-ab，01:23:45:67:89:ab．This form is also commonly used for EUI-64．
A．hard disk logical block address B．IP address
C．mail address D．MAC address

【正确答案】 D

【答案解析】[解析] 标准IEEE 802中， MAC地址输入的格式是6组两个十六进制数字，分隔的连字符用(-)或冒号(:)，例如01-23-45-67-89-ab、01:23:45:67:89:ab，这种形式也常用于EUI-64标识。