Computer Science for IGCSE & O level - Data Transmission (Section 7 - No. 43)
What happens if an error is detected during an echo check?
The data is sent again.
The data is automatically corrected.
The data is considered to be correct.
The connection is terminated.
Объяснение
If the data received by the sender differs from what was sent, an error is detected, and the data will be resent.