When the U.S. is described as having a dual system of health care, this means that:

a. government provides basic health insurance for all Americans and private insurance covers services beyond the basic level.
b. high quality care is provided in urban areas, but care in rural areas is of poor quality.
c. those Americans with good insurance or substantial wealth receive world-class health care, while those without insurance receive no or low quality health care.
d. the high-risk segment of the population is required to have health insurance, while the low-risk sector is not