Concept:An indent is an order placed by an importer through an agent for the supply of goods.Explanation:The type of indent determines how much freedom the agent has in choosing the supplier.A closed indent restricts the agent to a named manufacturer or source.An open indent gives the agent a free hand to obtain the goods from any manufacturer or source.Therefore, the document that allows the importer's agent to buy from any manufacturer is an open indent.Answer:D. An open indent