3. Consider the circuit shown, where the input is labeled 2B and the output is labeled F: 2B F a. The question is: what is the expression for the output F? b. How does the output change when considering propagation delay, Vpd (the delay from receiving an input to producing an output). What is the output when the propagation delay is zero seconds. What if the delay is a non-zero value? Sketch a plot of the output F when 2B is a squarewave with a period much greater than any of the Vpd values