The most valuable advantage of objective appraisals is that $\_\_\_\_\_.$

a$.$

They are harder to challege legally.

b$.$

They focus on qualitative results.

c$.$

Employees look better in them.

d$.$

They measure specific employee traits.

e$.$

Clients, coworkers, and managers provide their perspectives.

f$.$

Most employees can be perfectly measured by them.