According to Demorgan’s theorem the following equality

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According to Demorgan’s theorem the following equality (s) are correct—

1. AB = A + B
2. XYZ = X + Y + Z
3. A + B + C = A B C
4. All of these

Correct Option: D

AB = A + B
XYZ = X + Y + Z
A + B + C = A B C