a) Discuss the concept used in detecting a damaged data unit in the simple parity bit. (2 marks) b) Sender wants to send the following dataword to the receiver using two-dimensional even parity bits check: 11110101, 00111111, and 11100010 Find the row and column parity bits. marks) c) With the aid of a diagram, explain a situation where two-dimensional parity bit check could not detect four bits error in a transmission. (4 marks)