CWDM, or Coarse Wavelength Division Multiplexing, is the correct answer because it allows multiple optical signals to be transmitted simultaneously over a single fiber optic cable using different wavelengths, or colors, of laser light. This technique minimizes crosstalk and maximizes the bandwidth utilization for each signal. CWDM is cost-effective and typically used for systems that do not require high-density wavelength multiplexing, which makes it ideal for connecting geographically dispersed sites with lower bandwidth requirements compared to DWDM.