Final answer:
First-line managers are responsible for day-to-day operational decisions and supervising the activities of a specific department or team within an organization.
Step-by-step explanation:
First-line managers are not the managers who have the responsibility for making significant strategic policy decisions. They are actually managers who supervise the operational activities of a specific department or team within an organization. These managers are responsible for ensuring that tasks are completed efficiently, goals are met, and employees are properly trained and motivated. They work directly with employees and are usually responsible for making day-to-day operational decisions.