Who does supervisory/first-level management primarily work with?

Supervisory or first-level management primarily works with employees because their main role is to oversee the day-to-day operations of a team or group within the organization. This level of management directly interacts with employees, guiding them, providing training, and ensuring that tasks are completed effectively and efficiently. They are responsible for managing the performance of their team, addressing any immediate issues that arise, and helping to implement higher-level strategic plans at the operational level.

While they may also interact with customers to some extent, especially in industries where service is key, their primary focus remains on employee management and support. Engaging with mid-level management and executives is part of their role, but it is not the main aspect of their daily responsibilities. Thus, the correct choice highlights the direct relationship that first-level managers have with the employees who carry out the organization's objectives on a daily basis.