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21. Which is not true in CRC? A.only odd number of error that occur per transmission can be detected? B. it uses the concept of division to generate the CRC remainder? C. almost 99.99% of errors can be detected D. an error is undetectable of E(x) is divisible by P(x) 23. The Signal shown below is encoded using NRZ-I. Decode the binary Pattern (a) 110010111 (b) 001101000 (c) 101011100 (d) 100111000 28. In which line coding format is synchronization usually a problem when dealing with long strings of 1's? (a) AMI (b) Biphase (c) Unipolar (d) RZ