The Supplier Selection Decision

The supplier selection decision:

A) should always be preceded by a formal supplier evaluation and rating.
B) should be based on quantifiable factors such as price and delivery,and ignore social and environmental issues.
C) can be depicted by a decision tree identifying options,evaluation criteria,and probabilities of success and failure.
D) can be seen as a decision-making process undertaken in an environment of certainty.
E) is based on a uniform set of weighted criteria that can be applied to every purchase.