The types of boards that need to be upgraded when upgrading NG-SDH equipment are: 1. Cross-connect board 2. Main control board 3. Service board. What is the correct upgrade sequence?

The types of boards that need to be upgraded when upgrading NG-SDH equipment are: 1. Cross-connect board 2. Main control board 3. Service board. What is the correct upgrade sequence?
A . 123
B.321
C.213
D.312

Answer: C

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