Martha has enrolled in a Medicare Advantage plan. During the follow-up telephone call regarding enrollment verification, she learned some facts about the plan she had not previously understood. Which of the following options is true?
1) She must stay with the plan she originally chose for 1 year.
2) She needs to call her agent within 3 working days to change plans.
3) She can request plan cancellation over the phone during the enrollment verification call.
4) She must make a decision about canceling within 3 days of the call and submit a request to the insurer in writing.