A Supplier and a Retailer Have a Long,established Relationship

Multiple Choice

A supplier and a retailer have a long,established relationship.Earlier contracts between them have always provided the standard "within 30 days of delivery" payment provision.A new contract between them makes no reference to payment terms.What would a court most likely rely on to arrive at a decision that payment is due within 30 days of delivery?

A) customs in the trade
B) past dealings
C) business efficacy
D) statutory requirements