Answer:
b) Function
Explanation:
The Dean placed professors in departments based on the subjects they teach or based on their functions in the school. So all professors that function as economics professors are placed in the same department. This is an example of grouping employees by functions.
In geographic grouping, professors would be grouped based on the different regions they teach.
In product grouping, employees are placed in groups based on the product they produce.
I hope my answer helps you
