For the identity AB + AC + BC = AB + A C, the dual form

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For the identity AB + AC + 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. AB + AC + BC + AB + AC

Correct Option: A

Changing + sign to × and vice-versa