In a certain city there is a river running through the middle of the city. There are three islands and nine bridges as shown in the figure below.

A graph that appropriate models this situation would have
◦ 9 vertices and 3 edges.
◦ 3 vertices and 9 edges.
◦ 5 vertices and 9 edges.
◦ 9 vertices and 5 edges.
◦ none of these