Discussion
Which topology suits a current amplifier?
Answer: C
Current shunt lowers the input impedance and raises the output impedance, which is what a current amplifier needs: it accepts a current from a source without loading it in voltage terms and delivers a current independent of the load. The pattern is consistent - shunt at the input lowers, current sampling at the output raises - so the topology can be deduced from the wanted impedances rather than recalled.
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