What Is the Major Difference Between Medicare and Medicaid

What is the major difference between Medicare and Medicaid?

A) Medicaid funding comes totally from state taxes, Medicare is a federal program
B) Medicaid only covers people younger than age 65; Medicare only covers people over age 65
C) Medicaid insures at-risk infants and children, Medicare does not insure infants
D) Medicaid is required of everyone below the poverty line; Medicare is required of people over age 65