Which two statements are true about optical networks? (Choose two.)

Which two statements are true about optical networks? (Choose two.)
A . SONET and SDH both use time-division multiplexing.
B . An optical transport network system uses time-division multiplexing.
C . SONET and SDH both use wavelength-division multiplexing.
D . An optical transport network system uses wavelength-division multiplexing.

Answer: A, D

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