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How do you calculate the dynamic input resistance of a CB transistor?

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How do you calculate the dynamic input resistance of a CB transistor?

(a) ΔVBE / ΔIC

(b) ΔVBE / ΔIE

(c) ΔVCB / ΔIC

(d) ΔVCB / ΔIE

This question was addressed to me by my college director while I was bunking the class.

My doubt stems from Physical Model of a CB Transistor in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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The correct option is (b) ΔVBE / ΔIE

Explanation: Dynamic input resistance is defined as the ratio of change in emitter base voltage to the corresponding change in the emitter current. While the collector voltage is kept at a constant value. Therefore, ri = ΔVBE / ΔIE.

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