4. Given the function F(A,B,X,Y) = AB + X'Y, the most simplified Boolean representation for F' is

- (AB)' + (X'Y)
- A'B' + XY'
- (A'+ B')(X + Y')
- (AB + X'Y)'
- (AB)'(X'Y)'

5 is WRONG. Use DeMorgan's theorem one more time to further simplify the expression.

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