A Mealy sequential network is implemented using the network shown below. Assume that if the input Xchanges, it changes at the same time as the falling edge of the clock. Assume the following delays: XOR gate, 5 to 15ns; flip-flop propagation delay, 5 to 15ns; setup time, 10ns; hold time, 5ns. Initially assume that the "delay" is 0ns. a) Determine the maximum clock rate for proper synchronous operation. b) Assume a clock period of 100ns. What is the maximum value that "delay" can have and still achieve proper synchronous operation