Which of the Following Statements Is Correct

Which of the following statements is correct?

A) Companies must choose to use either job order costing or process costing;there is no overlap between the two systems.
B) Companies always use job order costing unless it is prohibitively expensive.
C) Companies always use process costing unless it is prohibitively expensive.
D) Companies often provide products and services that have both common and unique characteristics,so they may use a blend of job order and process costing.