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?

Select one:

a$.$ Skill$-$based pay

b$.$ Piece$-$rate pay

c$.$ Job evaluation system

d$.$ Seniority$-$based pay

e$.$ None of the answers apply.