What is the sum of the real roots of the equation 4x4−3x2+7x−3=0?<spanclass=′latex−bold′>(A)</span>−1<spanclass=′latex−bold′>(B)</span>−2<spanclass=′latex−bold′>(C)</span>−3<spanclass=′latex−bold′>(D)</span>−4<spanclass=′latex−bold′>(E)</span>None of above