Hmm, this one's a bit tricky. I'd go with A, C, and D, but I'm not 100% sure. Maybe the 'wavelength division multiplexing unit' is like a magical unicorn that keeps the whole system running?
A, C, and D are the way to go. The 'wavelength division multiplexing unit' sounds like a fancy name for a disco ball that can split light into different colors or something. Either way, I'm feeling pretty confident about this one.
I'm pretty sure the answer is A, C, and D. The optical transponder unit, optical amplifier unit, and supervisory unit are all essential for a WDM system to function properly.
A, C, and D seem like the obvious components of a WDM system. But what's a 'wavelength division multiplexing unit'? Is that like a super-powered disco ball?
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