For a Minimum Cost Flow Problem to Have a Feasible

Multiple Choice

For a minimum cost flow problem to have a feasible solution, which of the following must be true?

A) There is the same number of supply nodes and demand nodes.
B) There is only one supply node and one demand node.
C) There is an equal amount of supply and demand.
D) The supply and demand must be integers.
E) The transshipment nodes must be able to absorb flow.