The Example of "2/10" Net 30 Is a Type of Cash

The example of "2/10" net 30 is a type of cash discount and means that

A) payment is due within 30 days and that the buyer can deduct 2 percent for paying the bill within 10 days.
B) the bill is due within 30 days and the seller will add 2 percent interest for every day over the 30 days that the bill is not paid.
C) the bill is due within 30 days paid in full.
D) payment is due within 10 days and the buyer can deduct 2 percent for paying within the 10 day period.
E) payment is due within 20 days and the buyer can deduct 30% if paid within two days.