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How the input impedance of a common emitter transistor amplifier expressed in terms of transistor hybrid parameters?

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How the input impedance of a common emitter transistor amplifier expressed in terms of transistor hybrid parameters?

(a) hie – (hfe × hoe / YL + hre)

(b) hie + (hfe × hoe / YL + hre)

(c) hie – (hfe × hre / YL + hoe)

(d) hie + (hfe × hre / YL + hoe)

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The doubt is from Analysis of Transistor Amplifier Circuit using h-parameters in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Correct choice is (c) hie – (hfe × hre / YL + hoe)

Best explanation: The input impedance of a transistor amplifier circuit is expressed as V1 / I1. This can be expressed in terms of transistor hybrid parameters. The input impedance of a common emitter transistor amplifier in terms of hybrid parameters is expressed as hie – (hfe × hre / YL + hoe), where YL is the load admittance.

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