Question 3: 4-bit Shift Register using DFFs Design a 4-bit shift register using four DFFs (74LS74). The circuit should have one input called In, and four outputs Q1-Q4. - It should have a clock signal to indicate the change of state. It should have a Clear input to clear the data of all outputs. The following table shows the function of a 4-bit shift register. Iteration In Q1 Q2 Q3 Q4 (clock tick) 0 0 0 0 0 0 1 1 0 0 0 0 2 0 1 0 0 0 3 0 0 1 0 0 4 0 0 0 1 0 5 0 0 0 0 1 6 0 0 0 0 0 7 1 0 0 0 0 8 1 1 0 0 0 9 1 1 1 0 0 10 1 1 1 1 0 11 1 1 1 1 1 Draw the logic diagram of your circuit. (If you need a hint: connect the output Q of one DFF to the input D of another DFF and see what happens.)