If both x and y are both integers, how many pairs of solutions are there of the equation (x\minus{}8)(x\minus{}10) \equal{} 2^y?
<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>more than 3