Final answer:
First-line managers are responsible for supervising and coordinating the activities of operating employees in a business.
Step-by-step explanation:
The type of manager who would be responsible for supervising and coordinating the activities of operating employees is the First-line manager. First-line managers are also known as front-line managers or supervisors and they are directly involved in the day-to-day operations of a business. They are responsible for overseeing the work of lower-level managers and employees, ensuring that tasks are completed efficiently and according to organizational policies and procedures.