Discussion
Two systems have identical amplitude responses but different phase responses. They will
Answer: A
A single tone is affected only by the gain and a delay, so it emerges the same from both; a wideband pulse depends on the relative phases and so is distorted differently by each. That contrast is the cleanest demonstration of why the phase response matters. Identical behaviour for every input would require identical transfer functions. Power delivery follows the amplitude response. And noise figure is unrelated to phase.
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