Workhorse Air Crane Corporation Employs Blue-Collar Workers,computer Employees,outside Salespersons,and Professionals,including

Workhorse Air Crane Corporation employs blue-collar workers,computer employees,outside salespersons,and professionals,including pilots.Employees exempt from the Fair Labor Standards Act's overtime provisions include all of the following except 

A)  ​blue-collar workers. 
B)  ​computer employees. 
C)  ​outside salespersons. 
D)  ​professionals.