Buxton Snowboards offers an unlimited warranty on all parts attached to their boards. Which of the following statements is accurate with respect to their warranty liabilities:

a. Buxton must offer all customers a new snowboard if any parts are found to be defective

b. Buxton must fix the broken parts relating to the snowboard repair within 10 working days

c. Based on the matching principle, Buxton must record an estimated warranty cost based on snowboards outstanding at the end of an accounting period.

d. Based on the matching principle, Buxton must record an estimated warranty liability and corresponding warranty expense based on snowboards sold during the accounting period