Final answer:
The Correct option is 3). A product sold at or below cost is known as a loss leader, a strategy to attract customers to make additional purchases. This is different from freebie marketing, product bundling, and the controversial practice of tying sales.
Step-by-step explanation:
A product sold at or below cost is known as a loss leader. A loss leader is a pricing strategy where a product is sold at a loss in order to attract customers, with the expectation that those customers will make additional purchases at regular or marked-up prices. This strategy is widely used in retail to bring in traffic to stores. It's different from freebie marketing, where a company provides a complimentary item or service to promote a different product. Product bundling is another strategy where multiple products or services are offered as a package at a discounted rate.
Tying sales, which is a controversial practice where a customer must purchase an unwanted product to obtain the desired one, should not be confused with these strategies. Loss leaders aim to increase overall sales and customer traffic, not to force sales of unpopular items.