Concept:Pre-sale services are provided before the customer buys the product, while after-sale services are provided after the purchase.Explanation:Repair and maintenance work is carried out after the product has been sold.It helps the customer keep the product in good working condition.Providing product information, demonstrating its use, and setting up storage facilities all happen before the sale.Therefore, repair and maintenance work is not a pre-sale service.Answer:A. Repair and maintenance work