In devising a route to get water from a local lake to its central water storage tank, the city of Rocky Mount considered the various routes and capacities that might be taken between the lake and the storage tank. The city council members want to use a network model to determine if the city's pipe system has enough capacity to handle the demand. They should use:

the minimal spanning tree method

the shortest path method

the maximal flow method

any of the above will do

None of the above