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Which transformer is used for impedance matching in transistor coupled amplifier?

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Which transformer is used for impedance matching in transistor coupled amplifier?

(a) step-up

(b) step-down

(c) same turn ratio

(d) different  turn ratio

I have been asked this question by my school teacher while I was bunking the class.

I need to ask this question from Multistage Amplifier in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Best answer
The correct choice is (b) step-down

The best explanation: Usually the impedance of an output device is a few ohms whereas output impedance of the transistor is several 100 ohms. In order to match the impedance a step down transformer of proper turn’s ratio is used. The impedance of secondary of the transformer is made equal to the load impedance and primary impedance equal to the output impedance of the transistor.

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