Answer:
The best answers are Option 4 & 5
low-volume products with uncertain demand are obtained from a flexible source, while high-volume products with less demand uncertainty are obtained from an efficient source
Step-by-step explanation:
Tailored sourcing does not necessarily mean buying from two different sources it just makes use of a combined supply source.
One might be at a lower cost but is unable to deal with uncertainty well and the second more flexible but is at a higher cost.
Tailored sourcing may be volume-based or product-based depending on the source of uncertainty.