Solution
✅ Correct Option: 4
Offering a 10% discount to those who buy two products is a short-term incentive scheme used to induce demand. Discounts of this kind are listed among sales promotion techniques, and sales promotion is a component of the Promotion element of the marketing mix.
Note: The discount may appear price-related, but as a temporary demand-inducing scheme we have classified it under sales promotion, i.e., Promotion.