In xy \minus{}plane, there are b blue and r red rectangles whose sides are parallel to the axis. Any parallel line to the axis can intersect at most one rectangle with same color. For any two rectangle with different colors, there is a line which is parallel to the axis and which intersects only these two rectangles. (b,r) cannot be ?<spanclass=′latex−bold′>(A)</span>(1,7)<spanclass=′latex−bold′>(B)</span>(2,6)<spanclass=′latex−bold′>(C)</span>(3,4)<spanclass=′latex−bold′>(D)</span>(3,3)<spanclass=′latex−bold′>(E)</span>None