The complement of Boolean expression AB (B̅ C + AC) is

• A. (A̅ + B̅) + (B + C̅) + (A̅ + C̅)
• B. A̅ B̅ + (B + C̅)(A̅ + C̅)
• C. (A̅ + B̅) + (B + C̅) (A̅ + C̅)
• D. none of the above