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How do we compute the output impedance of a simplified CB amplifier?

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How do we compute the output impedance of a simplified CB amplifier?

(a) RC + RL

(b) RB + RL

(c) RC || RL

(d) RB || RL

This question was posed to me in final exam.

My doubt stems from Simplified Calculations for the CB Configuration topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct choice is (c) RC || RL

For explanation I would say: The output impedance of a simplified common base (CB) amplifier can be expressed in terms circuit resistor values. The base impedance is RC || RL. Where RC is the equivalent collector resistance and RL is the equivalent load resistance.

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