Which one of the following actions is guaranteed to result in lower labor costs per pair produced at one of your company's production facilities?

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Increasing total expenditures for best practices training by $10\%$ annually

Increasing spending for TQM$/$Six Sigma quality control from $$3$ per pair to $$5$ per pair

Increasing the base wage paid to production workers by at least $3\%$ annually

Reducing the S$/$Q rating of branded pairs produced for $4\mathrm{.}6$ stars to $4\mathrm{.}1$ stars

Increasing total employee compensation by $4\%$ and realizing a $6\%$ increase in production worker productivity