Correct option is A
Flip-Flop Definition:
A flip-flop is a basic memory element in digital electronics used to store a single binary digit, which can be either 0 or 1.
It is capable of storing one bit of information.
Explanation:
A single flip-flop has two stable states, representing a binary 0 or 1.
Multiple flip-flops can be combined to store more data, such as a byte (8 bits), but a single flip-flop stores only one bit.
