If Grace Wilson Is Eligible for Benefits Under Both the Medicare

If Grace Wilson is eligible for benefits under both the Medicare and Medicaid programs, then

A) Medicare is Ms. Wilson's primary insurer
B) A Medicare- or Medicaid-contracting health plan is allowed to lock-in Ms. Wilson's enrollment for a maximum period of 24 months
C) The BBA requires the state to guarantee Ms. Wilson's eligibility for a minimum of 18 months once she enrolls in a health plan network
D) Ms. Wilson can only receive Medicare- or Medicaid-covered services from a provider who participates in a health plan network