What Does "2/10" Mean,with Respect to "Credit Terms of 2/10,n/30

Multiple Choice

What does "2/10" mean,with respect to "credit terms of 2/10,n/30"?

A) A discount of 2 percent will be allowed if the invoice is paid within 10 days of the invoice date.
B) Interest of 2 percent will be charged if the invoice is paid after 10 days from the date on the invoice.
C) A discount of 10 percent will be allowed if the invoice is paid within two days of the invoice date.
D) Interest of 10 percent will be charged if invoice is paid after two days.