Distinguish between analog and digital signals.

The distinction between analog and digital signals is fundamentally rooted in the nature of their representation. Analog signals are continuous waveforms that can take on an infinite number of values within a given range. This means they represent information through varying frequency, amplitude, or phase. For instance, an analog signal could represent sound waves as they fluctuate continuously, capturing every nuance of the audio.

In contrast, digital signals are discrete, meaning they represent information in specific values or states, typically as a series of binary numbers (0s and 1s). Digital signals sample the analog input at different points and convey information in distinct steps rather than in a fluid manner. This results in a representation that can be easily processed and stored by digital electronics.

While other options may contain aspects related to analog and digital signals, they do not accurately reflect the fundamental characteristic that defines them. Thus, the clarity of this primary difference makes the first explanation the correct one.