Given the below logic diagram of the function F that has been implemented using only NAND gates. B a- Find the output expression at the points 1, 2, 3, and F without applying any changes to the...

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Extracted text: Given the below logic diagram of the function F that has been implemented using only NAND gates. B a- Find the output expression at the points 1, 2, 3, and F without applying any changes to the deduced expressions. b- Apply De Morgan's law (only once) to the function F and find the original expression of the function F. Show all the steps. C- Draw the 4-Var K-Map of the function F.