Audi amplifier, RF amplifier, along with what else are the three broad categories of frequency response for amplifiers?

The correct answer is the video amplifier, which is classified under the three broad categories of frequency response for amplifiers alongside the audio and RF (radio frequency) amplifiers.

Video amplifiers are designed to handle high-frequency signals with a bandwidth that typically ranges from a few megahertz to several gigahertz. This allows them to effectively amplify video signals without significant distortion, making them crucial in applications such as television, video conferencing, and other image transmission technologies.

Class D amplifiers, switching amplifiers, and digital amplifiers, while they have their own specific functions and uses, are technologies or methods of amplification rather than categories based on frequency response. They refer to how the amplification is achieved, rather than the frequency ranges they handle. Therefore, choosing a video amplifier clearly aligns with the established categories of frequency response alongside audio and RF amplifiers.