3 / 10,n / 30 Means

3 / 10,n / 30 means:

A) a 10 percent discount if paid in full within 3 days,or the net amount is due in 30 days.
B) a 3 percent discount if paid in full within 10 days,or the net amount is due in 30 days.
C) a 3 percent discount if paid in full within 3 days,or the net amount is due in 10 days.
D) a 3 percent discount if paid in full within 30 days,or the net amount is due in 10 days.
E) none of the above.