which of the following statements are true?
选项：

A:If all the vertices in a path are different, the path is called the basic path.;
B:If a vertex of a connected undirected graph is a cut point of the graph, it must be a joint point of a pair of vertices.;
C:If any pair of vertices are reachable to each other, then this graph is a strongly connected graph.;
D:If a graph is connected on one side, it is called weak partition graph.