Explanation:

- Option 1: Retirement benefit

- Social Security primarily provides retirement benefits. Workers contribute through payroll taxes, and upon reaching retirement age, they receive monthly payments.

- Option 2: Compensation facilities

- This term typically refers to workers' compensation, which is different from Social Security. However, disability benefits from Social Security can be considered a form of support similar to compensation.

- Option 3: Medical facilities

- Social Security includes Medicare, which is a federal health insurance program for people 65 and older or certain younger people with disabilities.

- Option 4: All of the above

- Given the diverse benefits covered, this option encapsulates the previous points effectively as Social Security touches on all these areas.