Which of the following communication technologies would MOST likely be used to increase bandwidth over an existing fiber optic network by combining multiple
signals at different wavelengths?

A.
DWDM

B.
SONET

C.
ADSL

D.
LACP

Explanation:
Dense wavelength-division multiplexing (DWDM) is a high-speed optical network type commonly used in MANs (metropolitan area networks). DWDM uses as many
as 32 light wavelengths on a single fiber, where each wavelength can support as many as 160 simultaneous transmissions using more than eight active
wavelengths per fiber.