【单选题】Sigma Inc., a software firm based in California, reordered 50 printers from the designated provider without any modifications. This is an example of ________.
【单选题】A company has reached the end of a contractual agreement with a vendor and wants to open it up for bid again before signing a new contract. This type of purchase situation is a:
【单选题】If a potential vendor offers what is perceived by a member of the buying center to be a better buy, the company may want to revisit the purchase decision. This type of situation is typically a: