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How do we compute the input resistance of a simplified CB amplifier model using hybrid parameters?

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How do we compute the input resistance of a simplified CB amplifier model using hybrid parameters?

(a) hfe / 1 – hfe

(b) hfe / 1 + hfe

(c) hie / 1 – hfe

(d) hie / 1 + hfe

I got this question in semester exam.

The query is from Simplified Calculations for the CB Configuration topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Right option is (d) hie / 1 + hfe

For explanation: The input resistance of a simplified common base (CB) amplifier can be expressed in terms of approximate hybrid parameters. The input resistance is hie / 1 + hfe where, hie and hfe are the input resistance and current gain of CE amplifier respectively.

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