Which of the following best defines a health insurance exchange?
a. a marketplace that brings together health insurers, health insurance plans, and insurance consumers, providing a venue through which consumers can review and purchase health insurance
b. a state-based, federally funded organization that provides technical, marketing, and administrative support services for health insurance companies
c. a virtual market where consumers can buy, sell, and trade shares of qualified health insurance companies
d. a program whereby individuals of similar demographics and risks can voluntarily form small groups and qualify for health insurance coverage at reduced rates