Which option describes a key feature of a Health Maintenance Organization (HMO)?

In a Health Maintenance Organization (HMO), a key feature is indeed lowering costs in exchange for limited provider choice. HMOs typically require members to select a primary care physician (PCP) who acts as a gatekeeper for referrals to specialists and other healthcare services. This structure enables the HMO to negotiate lower rates with a network of providers, as they are able to manage and control care within their network. Consequently, while members benefit from lower premiums and out-of-pocket costs, they must adhere to the network's guidelines and limitations, which can restrict their choice of healthcare providers and services. This balance of cost savings with limited provider options encapsulates the foundational principle of how HMOs operate within the healthcare system.