Find the minimal value of integer n that guarantees:
Among n sets, there exits at least three sets such that any of them does not include any other; or there exits at least three sets such that any two of them includes the other. <spanclass=′latex−bold′>(A)</span>4<spanclass=′latex−bold′>(B)</span>5<spanclass=′latex−bold′>(C)</span>6<spanclass=′latex−bold′>(D)</span>7<spanclass=′latex−bold′>(E)</span>8