Peachtree Windows Has No Windows in Inventory Waiting for Someone

Peachtree Windows has no windows in inventory waiting for someone to order them.It does not make a window until it is ordered.It is able to make 27,000 different window configurations.
-Refer to Peachtree Windows.The company promises delivery in five working days because of the excellent relationships it has established with its suppliers.What does this partnering relationship that Peachtree Windows has established with its suppliers and contractors indicate the use of?

A) supply chain management
B) yield management
C) channel networks
D) horizontal marketing networks