A company is deciding whether to produce a new gadget at a plant located in a country close to consumers at a higher labor cost and shorter lead time or to outsource it to a country with a low labor cost but a longer lead time. All else being equal, which of the following considerations would provide the most support to produce in the high-cost location? 

a. The holding costs per unit are low. 

b. Transportation costs per unit per km are low. 

c. The in-stock probability requirement for the product is high. 

d. Customers are willing to wait for delivery.