Computer Science for IGCSE & O level - Data Transmission (Section 4 - No. 5)

In the ARQ process, how are errors detected?

By using a parity bit.

By having the receiver send the data back to the sender.

By detecting whether the data is changed during transmission.

By calculating a checksum on the data before transmission.

ARQ uses checksums, or other error-detection codes, to identify if the data has been corrupted during transmission.