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WeeBee Company has three assembly labor classifications: S$-1,$ S$-2,$ and S$-3.$ The three classifications are paid $$16,$ $$19,$ and $$22$ per hour, respectively. The assembly activity for a product uses an S$-2$ employee who performs that task in $24$ minutes. To reduce the activity cost per unit, a product engineer proposes using a higher$-$rated employee who can perform the assembly in $21$ minutes. A manager proposes using a lower$-$rated employee who can perform the assembly in $30$ minutes. Which of the following provides the most cost$-$effective solution?

a$.$ use the S$-2$ employee

b$.$ use either the S$-1$ or S$-3$ employee

c$.$ use the S$-1$ employee

d$.$ use the S$-3$ employee