C is correct
The technology that enables the addition of new wavelengths in a fiber-optic network is called Dense Wavelength Division Multiplexing (DWDM). DWDM allows multiple optical signals, each operating at a different wavelength, to be combined and transmitted over a single optical fiber.
Reconfigurable Optical Add-Drop Multiplexer (ROADM) is indeed a technology used in conjunction with Dense Wavelength Division Multiplexing (DWDM) to manage and optimize wavelengths in a fiber-optic network. A ROADM allows for the flexible addition and dropping of specific wavelengths at different points in the network without disturbing the rest of the traffic.
So, while DWDM is the primary technology for adding new wavelengths, a ROADM is a key component that provides flexibility in routing and managing those wavelengths
Reconfigurable optical add-drop multiplexer(ROADM)
This allows individual or multiple wavelengths carrying data channels to be added and/or dropped from a transport fiber without the need to convert the signals on all of the WDM channels to electronic signals and back again to optical signals.
The correct is "D"
https://www.cisco.com/c/en/us/td/docs/optical/15000r10_0/dwdm/linecard_config/guide/b_ons_line_card_configuration/b_ons_line_card_configuration_chapter_010010.pdf
upvoted 2 times
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