Under FMLA a key employee is:

a$.$

a salaried eligible employee who is among the highest$-$paid $10$ percent of employees employed by the employer within $75$ miles of the facility at which the employee is employed.

b$.$

a salaried or hourly eligible employee who is among the highest$-$paid $10$ percent of employees.

c$.$

a salaried eligible employee who is among the highest$-$paid $25$ percent of employees employed by the employer within $100$ miles of the facility at which the employee is employed.

d$.$

a salaried or hourly eligible employee who is among the highest$-$paid $10$ percent of employees employed by the employer within $100$ miles of the facility at which the employee is employed.