Explanation: Class AB amplifiers are designed to operate for more than 180 degrees but less than 360 degrees of the input signal cycle. This conduction angle allows the amplifier to provide continuous current to the load throughout the waveform, preventing the "crossover distortion" seen in Class B amplifiers. However, it still biases the device closer to cutoff than Class A, improving efficiency over Class A. * **Class A** amplifiers conduct for the full 360 degrees, maintaining high linearity but low efficiency. * **Class B** amplifiers conduct for exactly 180 degrees (half of the cycle), offering better efficiency but introducing crossover distortion without a push-pull configuration. * **Class C** amplifiers conduct for less than 180 degrees, yielding very high efficiency but producing a highly distorted output, making them suitable primarily for RF power amplification with resonant tank circuits or for non-linear applications like FM.