Computer Science for IGCSE & O level - Data Transmission (Section 3 - No. 13)

What is the primary method to detect an error during the transmission?

Change the parity bit if an error occurs.

Using checksum after the whole byte is transferred.

Echo back the same data.

The data has to be encrypted and then decrypted

Echo checks primarily detect transmission errors by having the receiver send the same data back to the sender.