If a beneficiary is enrolled in a stand-alone prescription drug plan and wants to keep that plan, what type of Medicare health plan could the individual also enroll in, without being automatically disenrolled from the stand-alone prescription drug plan?

A. The beneficiary could only choose a Medicare Medical Savings Account (MSA) plan.
B. The beneficiary could only choose a Cost Plan.
C. The beneficiary could only stay in a stand-alone prescription drug plan if he or she has Original fee-for-service Medicare.
D. The beneficiary could enroll in a private fee-for-service (PFFS) plan that does not include prescription drug coverage; a Cost plan; or a Medicare Medical Savings Account (MSA) plan.