In Order to Cover Some of the Gap Between FFS

In order to cover some of the gap between FFS Medicare coverage and the actual cost of services, beneficiaries often rely on Medicare supplements. Which of the following statements about Medicare supplements is correct?

A) The initial ten (A-J) Medigap policies offer a basic benefit package that includes coverage for Medicare Part A and Medicare Part B coinsurance.
B) Each insurance company selling Medigap must sell all the different Medigap policies.
C) Medicare SELECT is a Medicare supplement that uses a preferred provider organization (PPO) to supplement Medicare Part A coverage.
D) Medigap benefits vary by plan type (A through L) , and are not uniform nationally.