If a forty-year-old person has been receiving Social Security Disability benefits for three years, which of the following medical plans is the person's primary payor?

Workers' Compensation typically covers medical expenses and lost wages for work-related injuries or illnesses. Since the individual in question is receiving Social Security Disability benefits, which are not related to a work injury, Workers' Compensation would not be the primary payor for medical expenses.

Unemployment Compensation provides financial assistance to individuals who are unemployed through no fault of their own. It does not cover medical expenses and is not relevant to the payment of healthcare costs for a disabled individual receiving Social Security Disability benefits.

The former employer's group health insurance could potentially cover some medical expenses, but in the case of a person receiving Social Security Disability benefits, Medicare would generally be the primary payor for healthcare services. Employer-based insurance is usually secondary to Medicare in such situations.