34. What is the function of the circuit in the figure if we focus on the voltage change across the resistor? Assume the RC time constant is large enough in the case.

(A) As a step-up transformer
(B) As a step-down transformer
(C) As a DC power supply
(D) As an AC power supply
(E) As a photodiode

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統計： A(0), B(0), C(3), D(0), E(0) #3840144