5555555555135. A 4-variable AND-OR circuit produces a 0 at its Y output. Which combination of inputs is correct? (a) A = 0, B = 0, C = 1, D = 1 (b) A = 1, B = 1, C = 0, D = 0 (c) A = 1, B = 1, C = 1, D = 1 (d) A = 1, B = 0, C = 1, D = 0

5555555555149. A 4-variable AND-OR circuit produces a 1 at its Y output. Which combination of inputs is correct? (a) A = 0, B = 0, C = 0, D = 0 (b) A = 0, B = 1, C = 1, D = 0 (c) A = 1, B = 1, C = 0, D = 0 (d) A = 1, B = 0, C = 0, D = 0

5555555555124. When does the output of a NAND gate = 1? (a) Whenever a 0 is present at an input (b) Only when all inputs = 0 (c) Whenever a 1 is present at an input (d) Only when all inputs = 1

5555555555145. One possible output expression for an AND-OR-Invert circuit having one AND gate with inputs A, B, and C and one AND gate with inputs D and E is ________. (a) (b) (c) (d)