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How do we compute the voltage gain of a simplified CB amplifier?

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How do we compute the voltage gain of a simplified CB amplifier?

(a) RB || re‘

(b) RC || re‘

(c) RB / re‘

(d) RC / re‘

This question was addressed to me at a job interview.

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

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Right answer is (d) RC / re‘

The best explanation: The voltage gain of a simplified common base (CB) amplifier can be expressed in terms circuit resistor values. The base impedance is RC / re‘. Where RC is the equivalent current resistance and re‘ is the alternating current resistance of the emitter-base diode.

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