Final answer:
The network of providers offering discounted rates to enrollees is a Preferred Provider Organization (PPO).
Step-by-step explanation:
The group of providers who formed a network and agreed to provide enrollees a discounted rate is known as a Preferred Provider Organization (PPO). A PPO is a type of health insurance plan that offers a network of healthcare providers, such as doctors and hospitals,
who have agreed to provide services to plan members at reduced rates. These providers, known as "in-network" providers, give plan members lower co-payments than they would receive if they used "out-of-network" providers. This arrangement provides incentives for plan members to use the providers within the network.