Which of the following statements about TTX board is correct?

Which of the following statements about TTX board is correct?
A . Essentially, the TTX board is not a 100G tributary board, but it requires a single-slot 100G cross-connect capacity.
B . 8800T64/T32 universal subrack can support TTX boards
C . This board is a tributary board that can access 100G client-side services
D . TTX can be used with NS4 to make ODU4 particles electrically cross-linked

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Answer: A