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

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

(a) hie – (1 + hfe) × RL

(b) hie + (1 + hfe) × RL

(c) hie – (1 + hfe) / RL

(d) hie + (1 + hfe) / RL

The question was asked in a national level competition.

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

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The correct choice is (b) hie + (1 + hfe) × RL

Explanation: The input resistance of a simplified common collector (CC) amplifier can be expressed in terms of approximate hybrid parameters. The input resistance is hie + (1 + hfe) × RL  where, hie and hfe are the input resistance and current gain of CE amplifier respectively and RL  is the load resistance.

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