How Would the Individual Ranking Method Rank a Group of 30

Multiple Choice

How would the individual ranking method rank a group of 30 employees?

A) All 30 employees would be given a letter grade from A to F.
B) Employees would be ranked in quintiles, e.g., the top fifth, the second fifth, and so on.
C) Employees would be ranked against one another in pairs.
D) Each employee would be ranked by number from 1 to 30.