Considering the available options, a discount to encourage prompt payment is that "all of these answers/choices are correct."
This is because a cash discount means the price of goods is reduced to encourage payment by the buyers.
Also, a sales discount by the seller means the product price is reduced so the buyers can quickly pay.
And again, when there is a purchase discount by the buyer, that means the buyer is allowed to pay a lower price for a specific good.
Hence, in this case, it is concluded that a sales discount is a good business strategy.
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