Final answer:
Flexible resources are supplied as demanded (used) and needed.
Step-by-step explanation:
The true statement regarding flexible resources is c. Flexible resources are supplied as demanded (used) and needed. Flexible resources are the type of resources that can be adjusted or scaled based on demand. They are not acquired in lumpy amounts or acquired in advance of usage through implicit contracting. Additionally, flexible resources are not always irrelevant while making tactical decisions as they can have a significant impact on operational efficiency.