Computer Science for IGCSE & O level - Data Transmission (Section 3 - No. 36)

In the context of data transmission, which of the following best describes the concept of an "Automatic Repeat Request (ARQ)"?

A method of data encryption.

A technique to improve transmission speed.

A method to request the retransmission of data if an error is detected.

A way to compress data.

ARQ is a mechanism that requests the retransmission of data if errors are detected.