In the Colored&Directioned scenario of 4D ROADM, how many sets of M40V+D40 are needed to realize local service scheduling to four directions?

In the Colored&Directioned scenario of 4D ROADM, how many sets of M40V+D40 are needed to realize local service scheduling to four directions?
A . 2
B . 1
C . 4
D . 9

Answer: C

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