Q4. (i) Design a 7-segment LED driver using the truth table given in the lecture notes, inside a hierarchical block. Assume only numbers from 0 to 9 will be sent to your block. Explain your design. Name your black with your student number: eg "123456 LED driver".. (ii) Test your circuit in block form using digital interactive constants to represent the inputs, and showing for every input combination what the LED display shows. Explain your testing. [4 marks]