Which of the following "rules of thumb" is incorrect with regard to making short-term business decisions?

A.

Past costs should not be used in the decision making process.

B.

Qualitative factors should be considered when analyzing a decision.

C.

Analysis should be performed using a traditional income statement approach.

D.

Per unit fixed costs should be converted to totals for analysis.

E.

Variable costs should be analyzed on a per unit.