Jonas has elected to recelve his Medicare coverage through a private company plan that offers all Medicare services, including prescription drug benefits. What kind of plan has Jonas enrolled in$?$

a$.$ a Medicare Part B plan

b$.$ a Medicare Part D plan

c$.$ a Medigap plan

d$.$ a Medicare Advantage plan

Roberto enrolled in a Medicare Advantage plan. He has a complaint regarding the plan's payment of his five$-$day hospital stay, According to the plan document, where should he go first to file a complaint?

a$.$ The state's insurance department

b$.$ his attorney

c$.$ the Medicare Alvantage plan administrator

d$.$ an independent review organization

Barbara enrolled in a Medicare Advantage plan this year. Based on this, which of the following statements is true?

a$.$ Barbara pays no costs at all for her medical care.

b$.$ Barbara was involuntarily disenrolled from Part A$.$

c$.$ Barbara must have prescription drug benefits.

d$.$ Barbara must continue paying the monthly Medicare Part $8$ premium.