( [3 marks (a) Provide an example showing that two dimensional parity checks can detect and correct 1 bit error. However it cannot correct a two bit error, though detect it. (b) Compute the Internet checksum of the following 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 00001001 (c) What would be the received message if CRC8 polynomial x8 x2+x1 +1 was used and the original message was 1011 00100100 1011