Concept:After-sales service is support given to a customer after the product has been purchased.
Explanation:The promise to repair a customer's vehicle for a stated period after the sale is a typical after-sales service.
It is meant to maintain customer satisfaction and build trust in the product or brand.
Marketing mix refers to product, price, place, and promotion.
Market segmentation divides consumers into groups with similar needs.
Sales promotion uses short-term incentives to boost purchases.
Only after-sales service matches the repair undertaking described.
Answer:A. after-sales service