Which of the Following Is the Best Description of a Buying

Which of the following is the best description of a buying centre?

A) It will be composed of the same decision makers as long as the purchasing process lasts.
B) It is typically on the formal organizational chart under the vice-president for operations.
C) It requires all purchasing participants to be employed by the purchasing department.
D) It refers to all those organizational members who become involved in the purchasing process.