Which two statements are true about optical networks?

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

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

A.
An optical transport network system uses wavelength-division multiplexing.

B.
SONET and SDH both use wavelength-division multiplexing.

C.
SONET and SDH both use time-division multiplexing.

D.
An optical transport network system uses time-division multiplexing.



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