Which purchasing strategy tends to be associated with a low$-$cost strategy?

Question $9$ options:

Purchase at low costs through quantity discounts; operate storage and warehouse facilities and control inventory efficiently.

Purchase high$-$quality inputs, even if they cost more; conduct storage, warehouse, and inventory activities with extensive care, even if costs are higher.

Purchase high$-$quality inputs, but only if costs are low; conduct storage, warehouse, and inventory activities with care, but only if costs are relatively low.

None of the above.