The United States Navy Purchases Uniforms from a Single Supplier

The United States Navy purchases uniforms from a single supplier. For the last five years, the trousers purchased from this supplier have not changed and have been bought in seven different sizes every six months under approximately the same terms of sale. This is an example of .

A) new-product purchase
B) demand purchase
C) straight rebuy purchase
D) modified rebuy purchase
E) standard order purchase