Discussion
Sampling the output voltage and holding it steady against load changes means what impedance?
Answer: A
Sampling the output voltage makes the amplifier work to hold that voltage constant whatever the load draws, which is exactly a low output impedance - divided by one plus the loop gain. Sampling the current would raise it instead. The rule at the output is that whichever quantity is sampled is stabilised, and stabilising a voltage means a low impedance while stabilising a current means a high one.
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