For how many ordered pairs (a,b) of integers does the polynomial x3+ax2+bx+6 have 3 distinct integer roots?<spanclass=′latex−bold′>(A)</span>5<spanclass=′latex−bold′>(B)</span>6<spanclass=′latex−bold′>(C)</span>8<spanclass=′latex−bold′>(D)</span>7<spanclass=′latex−bold′>(E)</span>4