Data Communication System

In one transmission, 110110101 digital data will be transmitted. 1. CRC algorithm will be used for error detection. Using the generator polynomial G(x) = x 4 + x + 1, FCS (Error detection bits) will be calculated and added to the above data. If the underlined bits have changed during the transmission phase, can the receiver detect this error with the parity bits? Why? Show it. (15p) 2. 2D Parity will be used for error detection. If the error could not be detected although some bits were changed during the transmission phase, give an example to this situation. (10 p)