6. Which of the following represents a violation of the matching principle? a. Recognizing expense related to the purchase of long-term assets to be used by the company in operations in the period of purchase. b. Recognizing pension expense in the current year for postretirement benefits earned by employees but not paid until retirement. c. Recognizing sales commission earned by employees for sales made during this period when the commission will be paid in the following period. d. Recognizing the cost of a three-year contract ratably over the course of three years. e. All of the above violate the matching principle