Steelweld, a Car Parts Manufacturer, Pays Employees a Higher Hourly

Steelweld, a car parts manufacturer, pays employees a higher hourly rate as they learn to operate more parts of the work process. Employees earn $10 per hour when they are hired and they can earn up to $20 per hour if they master all 12 work units in the production process. Steelweld is applying which of these reward systems?

A) Skill-based pay
B) Commission-based pay
C) Seniority-based pay
D) Job evaluation system
E) Piece-rate pay