x NAND x
Lets do it for AND first
x AND x = x (Idempotent property) Now take negation on both side ____ __
x.x = x
x NOR x
Lets do it for OR first
x OR x =x (Idempotent property) Now take negation on both side _____ ___
x + x = x
x NAND 1
Again do it for AND first x AND 1 = x Take negation on both side ____ __
x .1 = x
x NOR 1
Do it for OR first
x OR 1 = 1 Noe negate on both side ______ __
x + 1 = 1 = 0
So answer is D.
NOTE - Line (--------- ----) are representing negation