Answer:
The correct answer is letter "D": close, collaborative ties with suppliers.
Explanation:
A Supply Chain is a network of organizations that work in the production and distribution of a good. The network is managed by the manufacturer from gathering the raw materials until a final good is provided to end-consumers. The relationships between suppliers, producers, distributors, retailers, and customers are vital for the sustainability of the firm.
To ensure the high-quality of the production, most companies aim to establish strong bonds with their suppliers by promoting mutual efforts in an attempt to maximize each others' profits.