Analog describes

• A. A digital signal with discrete steps
• B. A continuously changing signal that is not restricted to a finite set of values
• C. A fixed-size binary value
• D. A type of computer peripheral

Answer: (B)

Analog describes a signal that changes continuously over time and can take any value within a range. This means there are infinitely many possible values, not just a limited set. For example, a microphone's audio signal varies smoothly as sound waves move, rather than jumping between fixed steps. In contrast, digital signals use discrete steps, a fixed-size binary value is digital, and a computer peripheral isn’t a description of signal type. So the best fit is a continuously changing signal that is not restricted to a finite set of values.