$5.$ Which of the following is NOT an effective way of dealing with a production constraint $($i$.$e$.,$ bottleneck$)?$

A$.$ Reduce the number of defective units produced at the bottleneck.

B$.$ Pay overtime to workers assigned to the bottleneck.

C$.$ Pay overtime to workers assigned to workstations located after the bottleneck in the production process.

D$.$ Subcontract work that would otherwise require use of the bottleneck.