What is the least value of (x−1)(x−2)(x−3)(x−4) where x is a real number?<spanclass=′latex−bold′>(A)</span>−41<spanclass=′latex−bold′>(B)</span>−31<spanclass=′latex−bold′>(C)</span>−21<spanclass=′latex−bold′>(D)</span>−1<spanclass=′latex−bold′>(E)</span>−2