John has set up a business that sells oil paintings. He has hired five employees. The following lists the duties of each of the five employees: Derek: Manages the painting process and paints most of the oil paintings. Phoebe: Sources canvas, oil, and paint from suppliers. Fiona: Takes calls from customers who have post-sales issues. Marcus: Arranges delivery of completed oil paintings to customers. Ting: Provide customers with professional advice to help customers choosing a painting that suits their budget and furnishing style. 11 of 14 Which of the following functions in the value chain is Ting performing? Service O Marketing and sales Outbound logistics O Operations