Credit term '4/20 net 90' means :

(A) 0.40% discount will be granted if the customer pays within 90 days

(B) 20% discount will be granted if the customer pays within 4 days, and if he does not avail the offer he must make payment within 90 days

(C) Net 90% discount will be granted if the customer pays 4 times the amount due within 20 days

(D) 4% discount will be granted if the customer pays within 20 days, otherwise he must make payment within 90 days