To be eligible for a Stand alone Part D plan, which of the following must the enrollee satisfy?

To be eligible for a Stand Alone Part D plan, an individual must be entitled to Part A or enrolled in Part B, and must reside in the service area of the plan they wish to join. This requirement ensures that beneficiaries have access to prescription drug coverage while also confirming they meet basic eligibility criteria linked to the Medicare program.

Part D plans are designed to supplement Medicare by providing prescription drug coverage, and having eligibility tied to Part A or Part B confirms a fundamental level of Medicare enrollment. Additionally, residing in the service area is crucial because Part D plans operate within specific geographic regions, ensuring that the plans can provide appropriate services to those who enroll.

The other options suggest requirements that don't align with the true eligibility criteria for a Stand Alone Part D plan. For example, being enrolled in both Part A and Part C is unnecessarily restrictive, as enrollment in Part B alone suffices. Income thresholds like $1,000 monthly are not standard criteria for selecting a Part D plan, and age restrictions, such as being over 65, do not apply since individuals under 65 can also qualify for Medicare under certain conditions. Thus, the answer detailing the entitlement to Part A or enrollment in Part B along with the requirement to reside in the service area accurately captures