Computer Science for IGCSE & O level - Data Transmission (Section 5 - No. 27)

Which of the following best describes "automatic repeat request (ARQ)"?

A method for encrypting data.

A system for detecting and correcting errors by retransmitting data.

A method to make the data transfer faster.

A technique for compressing data.

ARQ is a system designed to ensure reliable data transfer by requesting retransmission of data that has been lost or corrupted.