Suppose that a 90-Mbps binary data signal using binary NRZ encoding consumes 60 MHz bandwidth (a) Find the value of a, a signal design parameter that relates pulse rate (baud) to bandwidth (Hz). (reminder: B = 1 for binary NRZ) (b) For the same value of a obtained in Part (a), find the bandwidth required to deliver the same bit rate (90 Mbps) if instead of binary NRZ, Manchester data encoding is used (reminder: B = 0.5 for Manchester data encoding) (c) If only 6 MHz of channel bandwidth is available for transmitting data at a bit rate of 90 Mbps using M-level NRZ (M=4 case was shown in class), find the smallest M such that this is possible, provided that the same signal design parameter a applies