the following is a way to reduce costs and strive to achieve a competitive advantage based on lower overall costs per pair sold than rival companies ?...

which one of the following is a way to reduce costs and strive to achieve a competitive advantage based on lower overall costs per pair sold than rival companies ?

1. Keeping advertising costs in each geographic region to amounts that are below the industry average in that region.
2. Avoiding producing private- labor shoes.
3. investigators in one or more plant upgrades that the effect of lowering manufacturing costs per pair produced.
4. avoiding the use of overtime at the company's plants.
5. building production plants in all four geographic regions.