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When is Mary's Medicare Supplement Open Enrollment period if she
turns 65 on September 23, 2021, and her Medicare Part B effective
date is September 1, 2021?
a. The month of September 2021
b. October 15, 2021, through December 7, 2021
c. June 2021 through December 2021
d. September 2021 through February 2022