Credit Terms of 1/10,n/30 Mean That

Credit terms of 1/10,n/30 mean that:

A) 1% discount is allowed if the bill is paid within between 10 and 30 days.
B) a 1% discount is allowed if the bill is paid within 30 days.
C) a 1% discount is allowed if the bill is paid after 10 days.
D) a 1% discount is allowed if the customer pays the bill within 10 days,or the entre amount is due within 30 days.