. To get an OR gate from a NAND gate we need

A: Only two NAND gates

B: Two NOT gates obtained from NAND gates and one NAND gate

C: Four NAND gates and two AND gates obtained from NAND gates

D: None of the above

Explanation:

To obtain OR gate from NAND gate we need two NOT gates obtained from NAND gate and one NAND gate.

The figure is as

The expressions is

which is OR gate.

So, option (B) is correct.

Final Answer:

Hence, option (B) is correct. ( Two NOT gates obtained from NAND gates and one NAND gate )

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