A \( \frac{dQ_d}{dP} = f'(P) = 0 \)
B \( \frac{dP}{dQ_d} + Q_d = 0 \)
C \( \frac{dQ_d}{dP} = f'(Q_d) = \infty \)
D \( \frac{dQ_d}{dP} = f'(P) < 0 \)
Correct Answer: Option C
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