A wooden cube n units on a side is painted red on all six faces and then cut into n3 unit cubes. Exactly one-fourth of the total number of faces of the unit cubes are red. What is n?
<spanclass=′latex−bold′>(A)</span>3<spanclass=′latex−bold′>(B)</span>4<spanclass=′latex−bold′>(C)</span>5<spanclass=′latex−bold′>(D)</span>6<spanclass=′latex−bold′>(E)</span>7