multi choice; When can a receivable balance be satisfied with a smaller cash payment?

1. When a purchase discount has been paid by the seller.

2. When a sales discount is offered and the buyer pays within the discount period.

3. Neither when a sales discount is offered and the buyer pays within the discount period nor when a purchase discount has been paid by the seller.

4. Both when a sales discount is offered and the buyer pays within the discount period and when a purchase discount has been paid by the seller.