What are the advantages of a Darlington pair audio amplifier?

A Darlington pair consists of two bipolar junction transistors (BJTs) connected together such that the current amplified by the first transistor is amplified further by the second. This cascading effect creates a massive overall current gain, which is roughly the product of the individual gains of both transistors. Because the first transistor sees the input impedance of the second transistor multiplied by its own gain, the overall input impedance of the Darlington pair is exceptionally high. Conversely, its configuration yields a very low output impedance, making it highly effective for driving low-impedance loads like audio speakers. Other options are incorrect because they mention 'mutual gain,' 'mutual inductance,' or 'low input impedance.' These terms misrepresent the fundamental electronic properties of this specific two-transistor configuration.