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What is the value of output resistance in the CE short circuit current frequency response model?

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What is the value of output resistance in the CE short circuit current frequency response model?

(a) ∞

(b) 0

(c) hic

(d) hie

This question was posed to me during an internship interview.

This interesting question is from The CE Short Circuit Current Frequency Response topic in portion High Frequency Transistor of Electronic Devices & Circuits

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The correct answer is (a) ∞

Easiest explanation: The output resistance in a simplified common emitter hybrid model is calculated as the ratio of collector voltage over collector current while VS is equal to zero and RL is omitted. Due to this configuration IC is equal to zero and hence output resistance is infinite.

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