The rational expression fraction numerator x squared minus 9 x plus 20 over denominator x squared minus 3 x minus 10 end fraction simplifies to ___________.


a.)
fraction numerator x minus 4 over denominator x minus 5 end fraction


b.)
fraction numerator x plus 2 over denominator x minus 4 end fraction


c.)
fraction numerator x minus 5 over denominator x plus 2 end fraction


d.)
fraction numerator x minus 4 over denominator x plus 2 end fraction