For the Boolean expression: X = A + B, when does X = 0?
A. when A=1 or B=1, even if A=B=1
B. when A=1 and B=1
C. when A=0 and B=0
D. when A=1 or B=1, but not when A=B=1
E. when A=0 or B=0
Answer: C
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