How many constraints (not including non-negativity constraints) are there in this problem?

Lincoln Motors has production plants in Savannah and Atlanta with major warehouses in Austin and Galveston. All automobiles are then shipped to customers in Phoenix, Jacksonville, and St. Louis. The Savannah plant can produce 150 cars per week while the Atlanta plant can produce 100 cars per week. Phoenix requires 80 cars per week, Jacksonville requires 70 cars per week, and St. Louis requires 60 cars per week. Shipping costs per car are:

	Austin (node 3)	Galveston (node 4)
Savanah (node 1)	1253	637
Atlanta (node 2)	1398	841

	Phoenix (node 5)	Jacksonville(node 6)	St. Louis(node 7)
Austin	1059	996	1691
Galveston	2786	802	1100

Because of state regulations in Texas, no more than 40 automobiles may be shipped from Austin to Phoenix or from Galveston to Phoenix.

Group of answer choices

19

7

None of the above

17

10

9

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