An e-commerce revenue model where the seller has control over pricing but doesn't keep products in stock and instead transfers customer orders and shipment details to a third-party supplier, who then ships the goods directly to the customer, is called :

Correct Option: (a) Dropshipping Model

The correct option is (a). A Dropshipping model is an e-commerce business model where the retailer does not keep goods in stock. Instead, when a customer places an order, the retailer purchases the item from a third-party supplier, who then ships it directly to the customer, while the retailer maintains pricing control. Option (b) Affiliate Revenue Model refers to generating traffic or sales and earning commission, not direct inventory-free order fulfillment. Option (c) Transaction Fee Revenue Model involves charging a fee for enabling a transaction. Option (d) Agency Revenue Model involves acting as an agent for a commission. Therefore, options (b), (c), and (d) are incorrect.