Discussion
Why is a bandwidth specification quoted with a power level?
Answer: C
An amplifier's small-signal bandwidth can be far wider than the frequency at which it can still deliver full output, because the rate at which the output can change is limited independently of the small-signal response. Load impedance, stability and device temperature are separate matters. Two independent limits govern the same amplifier, one for small signals and one for large, and a bandwidth figure that does not say which is being described is incomplete. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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