If the equation system f(x)+g(x)f(x)−(g(x))3==00 has more than one real roots, where a,b,c,d are reals and f(x)=x2+ax+b, g(x)=x2+cx+d, at most how many distinct real roots can the equation f(x)g(x)=0 have?<spanclass=′latex−bold′>(A)</span>0<spanclass=′latex−bold′>(B)</span>1<spanclass=′latex−bold′>(C)</span>2<spanclass=′latex−bold′>(D)</span>3<spanclass=′latex−bold′>(E)</span>4