(a) For the following circuit write the name of the "appropriate circuits/blocks" in the dotted boxes. Also draw the required "input lines" and give them names. [Hint: Total 4 inputs will be required] [12.5 points] Note: When "Row_Enable = =1 ", the row is activated, else deactivated. Draw lines Explanation of your answer: (b) Write the appropriate values of the input lines such that the output equals " N ". Note: When "Row_Enable =1 ", the row is activated, else deactivated. You must explain how you chose your answer. [12.5 points] Explanation: Problem 4 (15 points) (b) Draw the circuit (using Full Adders (FA)) that can subtract two 3-bit numbers: (a2a1a0)(b2b1b0). You can use the FA block diagram directly and other necessary logic gates. [Hint: Subtraction is same as 2s complement addition. 2 s complement = flip bits and add 1] [10 points] (c) What is the critical path delay (longest path delay of the above circuit) ? Assume delay of a logic gate is tlogic and delay of FA is tFA. Explain how you calculated the propagation delay. [5 points]