B5. Design a circuit of 2-bit even parity generator: to add an extra bit to 2-bit data such that the number of 1's in the data is always even. Show the following steps in your answer: [4 marks] a. Draw the block diagram. [0.5 mark] b. What are the Inputs and the output? [0.5 mark] c. Construct the Truth Table. [1 mark] d. Write the Boolean expression for the output function. [1 mark] e. Build the circuit. [1 mark]