make decisions about the use of an organization's resources and are concerned with planning, organizing, directing, and controlling the organization's activities.

Managers

Explanation:

A manager is a person that oversee or that is in charge of an aspect or section of a company with a quite number of junior staff or employees working under him/her.

The manager make use of the basic management  functions which are, planning , organizing, leading and controlling , to oversee the section of the company successfully.

The manager has the responsibility of making sure that the work or activity is done efficiently and that the company's goal is the focused and eventually achieved.

i honestly speaking this is too long