Answer:
I, II, and III
Step-by-step explanation:
Customer sales service is representative of the services given to a customer who has bought or continues to buy a product or service from a company and includes after sales service that can be provided by a manufacturer, retailer, a third party training provider, or automated self service. The provision of customer sales service improves the relationship between the customer and the company, and it is an important aspect of customer satisfaction
Therefore, customer sales service comprises technical support, customer service, and automated customer service which is the option I, II, and III