According to De Morgan’s second theorem—

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According to De Morgan’s second theorem—

1. A NAND gate is always complimentary to an AND gate
2. An AND gate is equivalent to a bubbled NAND gate
3. A NAND gate is equivalent to a bubbled AND gate
4. A NAND gate is equivalent to a bubbled OR gate

Correct Option: D

Hence alternative (D) is the correct answer.