4. Assume CMOS transistors. a) Write out the truth table for a 3-input NAND. b) Draw a CMOS transitor circuit that implements it. Note the total number of transis- tors you use. c) Now write out a truth table for a 3-input AND. d) Draw the CMOS transistor circuit for this truth table. Don't forget to adhere to the pMOSMOS connection rules! Hint: you'll need to add inverters to inputs