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The correct answer would be, Medicare prescription drug plans are not permitted to cover the prescription medications the Vaughns are interested in under Part D coverage, however, plans may cover them as supplemental benefits and the Vaughn's could look into that possibility.Explanation:When people buys a health care insurance coverage, many of the diseases' treatments are covered under that insurance. But not every disease or medication is covered through these insurances, Especially, some dental treatments, some vitamins tablets, etc are not usually covered under such plans.Supplemental coverage is the solution if someone takes vitamins or other supplements on regular basis.So the prescription medication that Vaughns are interested to buy will not be covered by regular health coverage plan. They must look into the possibility of opting the Supplemental coverage instead.Learn more about Health Care Insurance Plans at:brainly.com/question/12956361#LearnWithBrainly...