Please I would like a lot of fast and simple answers.

a. In a transmission, digital data of 101011011011 will be transmitted. CRC algorithm will be used for error detection. By using generating polynom G(X) = x2 + 1, FCS (error control) bits are calculated and added to above data. During the transmission if underscored bits are changed, can the receiver detect the error? Why? (15 p) b. If this data is transmitted by using 2D Parity, how many parity bits are required? Give an example for the case where error is detected but could not be corrected. (Consider 3 columns and 4 rows) (10 p)