which three DWDM technologies is the Cisco NCS 2000 Series optimized?

Around which three DWDM technologies is the Cisco NCS 2000 Series optimized? (Choose
three.)

A.
dispersion compensation

B.
arrayed waveguide gratings

C.
coherent wavelengths

D.
SONET/SDH switching

E.
Flex Spectrum

F.
touchless ROADM