A customer has 20 E1s to add between far-end nodes in an SNCP ring. What type of circuit would you recommend？（）
- A、 LO-PATH circuits
- B、 HO-PATH circuits
- C、 1：1 protection circuits
- D、 1：N protection circuits
- E、 LO-PATH tunnel circuits
正确答案:E
答案解析:有
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