题目内容：
根据下面的文字资料回答题For each blank．choose the best answer from the four choices and write down on the answer sheet．（ 1 ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication。
（ 2 ）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols．
（ 3 ）functions with two layers of protocols．It Can connect networks of different speeds and can be adapted to an environment as it expands．
（ 4 ）is the popular LAN developed under the direction of the IEEE 802.5．
（ 5 ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSl．文中（ 1 ）处正确的答案是（ ）。 A．The MAC address
B．The IP address
C．The subnet address
D．The virtual address
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