Which of the following statements about American healthcare are correct? Select all that apply.
a. Children's Health Insurance Program (CHIP) covers children in families that earn too much to qualify for Medicaid and sometimes pregnant women.
b. Medicaid is the largest single-payer national health insurance program providing healthcare coverage for those ages 65 years and older.
c. In the United States, most working-age adults are covered by Medicare.
d. Healthcare is recognized as a fundamental right in the U.S. Constitution.