Of the following options, which one is an extra policy that covers the gaps in the original Medicare program?

Medigap is the policy that covers the gaps in the original Medicare program. Medigap, also known as Medicare Supplement Insurance, is a private insurance policy that helps pay for certain healthcare costs that are not covered by Medicare Part A and Part B, such as copayments, coinsurance, and deductibles. It is designed to provide additional coverage to fill in the "gaps" left by Medicare, hence its name.