__________ is a way of purchasing inventory where the retailer doesn't keep any of the products it sells in stock. Instead, items are purchased from a third-party supplier as and when each customer order comes in, with the supplier shipping products directly to the customer. It entirely negates the need for inventory storage or keeping stock on-hand. Group of answer choices Self-fufillment warehouse Cross Docking Third-party logistics (3PL) service Dropshipping