Offering regular customers discounts on products is known as an external incentive.
Option D
Explanation:
External incentives can be defined as the form of additional bonus, products, loyalty services or exclusive deals. Incentives help in developing the brands in the following areas,
External incentives acts as simulator in boosting the business levels; improving the brand and increasing the sales. For example, offering free mints after a meal in restaurants would attract more customers to the restaurant.