5. The following waveform pottem is for a(n) ( A and B are inputs, X is an outpot ). A. 2-input AND gate B. 2-input OR gase C. Exclusive-0R gase D. None of the above 6. To implement the expression ABCD+BCD+ABD, we need one OR gate and A. three AND gates and three imverters B. three AND gates and fowr imverters C. three AND gases D. one AND gate 7. Which of the following graphical symbols is equivalent to an OR gate? b) c) d) 8. Which of the following set of gates is considered as universal? A) AND and OR B) NAND C. AND D) OR 9. Which of the following two functions are equivalent? 1) XY+XY ii) XY iii) XX+XY iv ) XYXY A) iand in B) in and i C) iii and iv D) in and