Discussion
What is the practical reason for specifying a signal's spectral mask?
Answer: B
A spectral mask bounds how much power may fall outside the assigned channel, which is what protects neighbouring users from interference and makes dense frequency reuse possible. It says nothing directly about the data rate achieved inside the channel. Noise figure is a receiver specification. And the modulation index is a transmitter parameter that the mask constrains indirectly, by limiting the spectral spreading it may cause.
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