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How do we compute the base impedance of a simplified CC amplifier?

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How do we compute the base impedance of a simplified CC amplifier?

(a) β × (Re – re‘)

(b) β × (Re + re‘)

(c) RB || β × (Re – re‘)

(d) RB || β × (Re + re‘)

I had been asked this question in class test.

My question comes from Simplified Calculations for the CC Configuration in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct answer is (b) β × (Re + re‘)

Easy explanation: The base impedance of a simplified common collector (CC) amplifier can be expressed in terms circuit resistor values. The base impedance is β × (Re + re‘) . Where β is the transistor amplifiers current gain, Re is the equivalent emitter resistance and re‘ is the alternating current resistance of the emitter-base diode.

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