The boolen expression (A+C̄)(B̄+C̄)
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Answer: A) C̄+AB̄
Expanding gives AB̄ + AC̄ + B̄C̄ + C̄ = C̄ + AB̄, since AC̄ + C̄ = C̄ and B̄C̄ is absorbed by C̄.
Expanding gives AB̄ + AC̄ + B̄C̄ + C̄ = C̄ + AB̄, since AC̄ + C̄ = C̄ and B̄C̄ is absorbed by C̄.