Which of the following function of management is both a line as well as staff activity?

Staffing

The correct answer is option 3- staffing.

Staffing is both a function of management just like planning, organising, directing, and controlling as well as a distinct functional area of management just as marketing management and financial management. Staffing, is therefore, referred to as both a line as well as a staff activity i.e., an essential function of the manager as well as an advisory role played by the Human Resource Department.