4. A packet 10111011 is to be transmitted using the standard CRC method. The generator polynomial is x3+1. a) Determine the frame that is actually transmitted. b) Suppose the third bit from the left is inverted during transmission. Determine if this error is detected at the receiver's end. c) What kind of burst errors can be detected by the above generator polynomial? 3. What is the remainder obtained by dividing x7+x5+x2 by the generator polynomial x4+x+1? (DO NOT ADD ANY ZEROES) 2. If a binary signal is sent over a 6-kHz channel whose signal-to-noise ratio is 20dB, what is the maximum achievable data rate? S/N