What is a digital-to-analog converter?

1. 

What is a digital-to-analog converter?
[A]. It takes the digital information from an audio CD and converts it to a usable form.
[B]. It allows the use of cheaper analog techniques, which are always simpler.
[C]. It stores digital data on a hard drive.
[D]. It converts direct current to alternating current.

Answer: Option A

Explanation:

A DAC converts an abstract finite-precision number (usually a fixed-point binary number) into a concrete physical quantity (e.g., a voltage or a pressure).

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