​Which of the following are ways of promoting a firm's product

A) ​Advertising
B) Discount coupons
C) End-of-aisle displays
D) ​All of the above

Advertising is a common way of promoting a firm's product by using various media channels to spread the word about the product to the target audience. Discount coupons encourage potential customers to buy the product by offering them a price incentive. End-of-aisle displays attract the attention of customers by creating a prominent and visually appealing display of the product. All the above methods are effective ways of promoting a firm's product.