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What we use for impedance matching in RF amplifiers?

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What we use for impedance matching in RF amplifiers?

(a) RC coupling

(b) Transformer coupling

(c) Direct coupling

(d) RF coupling

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Query is from Instantaneous Frequency and Frequency Modulation in section Angle Modulation of Analog Communications

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Correct choice is (b) Transformer coupling

To explain: Impedance matching is the input impedance of an electrical load or the output impedance of corresponding electrical signal source to maximize power transfer or minimize signal reflection from the load. Transformer coupling is basically used for impedance matching in RF amplifiers. It is usually used with a small load for power amplification.

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