Final answer:
Social Security is the program from the given options that is classified as 'Social Insurance' while SNAP, Medicaid, and TANF are considered 'Public Assistance'/ 'welfare'.
Step-by-step explanation:
The program that is NOT considered 'Public Assistance'/'welfare' but rather 'Social Insurance'/an entitlement for the 'deserving poor' among the options given is Social Security. This is because Social Security is funded through payroll taxes paid by workers and employers, and it operates as an insurance program where benefits are based on the earnings record of the workers who paid into the system. In contrast, programs like SNAP (Supplemental Nutrition Assistance Program), Medicaid, and TANF (Temporary Assistance for Needy Families) are considered welfare or public assistance as they are designed to provide aid to individuals based on need rather than contributions made.