The standard （IEEE 802) format for printing （72） in human－friendly form. is six groups of
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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.
（72）
A. hard disk logical block address
B. IP address
C. mail address
D. MAC address
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