1. What is true regarding digital compression?

a. lossless digital compression techniques guarantee that the original analog signal will be reconstructed with no information losses after the DAC process is completed

b. lossy compression techniques are never used since this means a loss in information

c. digital compression techniques eliminate information to decrease file size, therefore there is no such thing as a lossless compression technique i.e., it is only theoretical

d. lossless compression techniques avoids information loss during the data compression process

2. Select the correct statement(s) regarding 4B5B.

a. a four bit dataword is mapped to a 5bit codeword; this result in only half of the possible codewords being mapped to legitimate datawords.

b.4B5B means that only 80% of the codeword represents information, with 20% representing overhead.

c. 4B5B avoids long string of logical "1s' and "0s", thus enabling use of simpler line coding techniques.

d. all statements are correct.