Haya Noticed That College Students Needed to Dress Up for Presentations

Haya noticed that college students needed to dress up for presentations but never seemed to have any ties, or at least not very nice ones. She decided she was going to set up a tie store on her campus and offer sports themed ties as well as solid colored ties in her school colors. She can put an announcement on the school's monitors that would display in the dining halls and student union. Haya orders 40 ties in each of the school colors and 10 in each of four sports. Which of the following is true about Haya's supply chain?

A) Haya is using a just-in-time inventory system.
B) Haya is using a vendor-managed inventory.
C) Haya is building inventories.
D) Haya has vertical integration with her upstream supplier.
E) Haya is using a pull model.