Which of the following statements is TRUE?

A. Classifying a cost as either direct or indirect depends upon the behavior of the cost in response to volume changes.

B. Classifying a cost as either relevant or irrelevant depends upon whether the cost can be easily identified with the cost object.

C. Classifying a cost as either product or period depends upon whether the cost is expensed in the period in which it is incurred.

D. Classifying a cost as either fixed or variable depends upon whether an expenditure is avoidable or not in the future.