Answer:
The correct option is A,devoting resources to researching and developing new products that will be more durable than competitors'
Explanation:
Creating sustainable advantage means that the company is able to do something very difficult for competitors to copy.
Sustainable advantage is not about cost reductions,is about a perceived value added to products or services not seen anywhere else.
If customers upload their designs for the company to produce, it does not necessarily mean the product is fit for purpose, as the company does not have full control over it.