What is the minimum sum-of-products (SOP) that can be derived from this Karnaugh map: 0 1 010 1 575 of(a,b) = ab + !alb of(a,b) = a + b of(a,b) = a + b Ofla,b) - a!b+ lab of(a,b) = a + b Of(a,b) = a + !b None of these. Of(a,b) = ab f(a,b)-la!b