1. The problem asks to identify the category to which contests, sweepstakes, coupons, premiums and gifts, product samples, rebates, low-interest financing, price discounting, point-of-sale displays, and frequent user or loyalty programs belong. 2. These are all examples of marketing techniques used to stimulate consumer purchasing and sales. 3. The main categories given are sales promotion, advertising, and interactive marketing. 4. Sales promotion includes short-term incentives to encourage the purchase or sale of a product or service, such as coupons, rebates, contests, and loyalty programs. 5. Advertising is a paid form of non-personal communication about products or services. 6. Interactive marketing involves direct engagement with customers, often through digital means. 7. Since the examples given are all short-term incentives and promotional tools, they fall under sales promotion. Final answer: sales promotion.