For which one of the following, sequential parity checker is useful?

For which one of the following, sequential parity checker is useful? Correct Answer Digital Communication

Parity bits are used to detect error in a data transmission system. Based on the number of 1s in a data pack and based on the parity system, the last parity bit is added. As we send bit streams in case of digital communication only thus, the answer will be digital communication.

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Which flip flop is generally used to build a sequential even parity checker?
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