Assume that you are given an ER diagram for some problem-domain/enterprise. If we ignore the context and view the ER diagram abstracted as a pure graph (e.g., just vertices and edges, regardless of whether a vertex is an entity or a relationship), how could the following be interpreted in the context of any enterprise: The graph is disconnected (i.e., just by looking at the graph, what can be said about the entities and relationships among them)?