Which of the following circuit is used as a memory device in computers?
The correct answer is:
\[
\textbf{A. Flip-Flop}
\]
Explanation:
A flip-flop is a basic memory element in digital electronics used for storing binary data (0 or 1). It is used in various memory devices such as registers, caches, and RAM in computers.
A rectifier is used to convert alternating current (AC) to direct current (DC), and is not a memory device.
A comparator is used to compare two input signals, typically for determining which one is larger, and is not used for memory storage.
Hence, the correct answer is Flip-Flop.
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