题目内容
(请给出正确答案)
[单选题]
Which of the following boards does R4ASB on ZXCTN equipment stand for?()
A.n4 ports Enhanced Gigabit Ethernet Combo interface
B.n4 ports Channelized POS STM-1 Board
C.n4 ports Channelized STM-1 Board
D.n4 ports ATM STM-1 Board
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