Notes to the financial statements present information on significant accounting policies, complex or special transactions, details of reported amounts, commitments, contingencies, segments, quarterly data, and subsequent events. Indicate the type of note disclosure that is illustrated by each of the following notes:

a. Sales by the Farm and Equipment segment to independent dealers are recorded at the time of shipment to those dealers. Sales through company-owned retail stores are recorded at the time of sale to retail customers.

b. Members of the board of directors, the advisory board, and employees are not charged the vendor's commission on property sold at auction for their benefit. (From the notes of an auctioneer company.)

c. Sales to an airline company accounted for approximately 48 percent of the company's net sales in the current year.

d. The company's product liability insurance coverage with respect to insured events occurring after January 1 of the current year is substantially less than the amount of that insurance available in the recent past. The company is now predominantly self-insured in this area. The reduction in insurance coverage reflects trends in the liability insurance field generally and is not unique to the company.