ind f(x,y) for f(x,y) = -5x²y² +8x² + 2y² + 5x OA. f(x,y)= - 10xy + 16x+4y+5 OB. f(x,y) = -10xy² + 16x+5 OC. fx(x,y) = -20xy + 16x + 4y +5 O D. f(x,y)= - 10x + 16x + 5 OE. f(x,y)=-20x²y² + 16x + 4y² +5