Final answer:
The OASDI stands for 'Old-Age, Survivors, and Disability Insurance,' which together with Medicare (Health Insurance) constitute parts of the U.S. Social Security system, providing retirement, disability, and healthcare benefits, respectively.
Step-by-step explanation:
The options OASDI and HI refer to components of the Social Security system in the United States. The correct answer is d) Old Age and Survivors Disability Insurance. OASDI stands for Old-Age, Survivors, and Disability Insurance program, which is a comprehensive federal benefits program that provides retirement, disability, and survivors benefits. HI stands for Health Insurance, which is the Medicare program that also forms part of the social security benefits, ensuring healthcare coverage to the elderly and disabled persons.
Social Security is a social insurance program that was established to provide economic protection to American workers and their families in case of retirement, disability, or death, ensuring a source of income during such events. It is funded primarily through payroll taxes where both employers and employees contribute. Retirement insurance and Medicare, a form of health insurance for the elderly and disabled, are key elements of this system.