Computer Science for IGCSE & O level - Data Transmission (Section 1 - No. 5)

Which of the following methods uses an extra bit added to a byte to ensure an even number of 1s or an odd number of 1s?

Cyclic redundancy check

Parity check

Echo digit

Check digit

A parity check adds an extra bit to a byte to ensure an even or odd number of 1s. If this does not work, there is an error.