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ISRO 2007-ECE Boolean Dual

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For the identity $AB + A' C + BC = AB + A' C$, the dual form is

  1. $(A+B) (A'+C)(B+C)= (A+B)(A'+C)$
  2. $(A'+ B') ( A' + C') (B'+C')= (A'+ B') (A +C')$
  3. $(A+B) (A'+C) (B+C) = (A'+ B') (A+ C')$
  4. $A'B'+AC'+ B'C'= A'B'+AC'$
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