Answer:
Option 4= I-O is correct.
Explanation:
I-O full meaning is Industrial-Organization. Industrial-Organization Psychologists are expert personnel that uses psychology principles to solve certain problems to improve the quality of life.
Industrial-Organizational Psychology is also popularly known as organization psychology, work psychology or occupational psychology.
Industrial-Organization psychology is a branch of psychology that has its main aim on increasing workplace productivity and also, all issues related to workplace. Issues such as the mental and physical well-being of the workers.
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