Number of NAND gates are required to realize the function

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Number of NAND gates are required to realize the function—
F = ( X + Y). (Z + W)

1. 3
2. 4
3. 5
4. 6

Correct Option: B

In order to solve such type of problem first reduce any from into to SOP (sum of product from).
F = ( X + Y). (Z + W)
or F = XY(Z + W)
or F = XYZ + XYW
So, the number of NAND gate requirement is equal to 4.