Right option is (d) AVK = AIK × RLK / RiK
Best explanation: The gain for any intermediate stage in an n-stage cascading amplifier can be calculated using AVK = AIK × RLK / RiK. Where, AIK, RLK and RiK is the estimated with respect to the values of the previous stages. AIK represents the voltage gain while RLK and RiK represent the effective load impedance.