Correct Answer: Sales department

Solution : The correct answer is (d) Sales department

Line functions are directly involved in the primary activities or core operations of an organization. They are responsible for carrying out the main tasks related to producing goods or delivering services that contribute directly to the organization's objectives and generate revenue.

The sales department plays a vital role in generating revenue for an organization by identifying potential customers, promoting products or services, negotiating sales, and closing deals. It is directly involved in the revenue-generating activities of the organization, making it an example of a line function.