Final answer:
The sales department depends on operations for information on all aspects mentioned - Inventory, Customer orders, and Demand forecasts, to make well-informed decisions.
Step-by-step explanation:
The sales department needs to rely on information from operations to understand all of the above: Inventory, Customer orders, and Demand forecasts. Inventory details are crucial to know what products are available for sale. Customer orders provide insight into current sales trends and customer preferences, which is essential for both immediate sales strategy and longer-term planning. Demand forecasts involve predictions about future sales and are pivotal for preparing to meet customer needs effectively. Utilizing these pieces of information can help the sales department make informed decisions to drive business success.