Which compound sentence contains the correct punctuation?

i love vanilla ice cream but, my sister likes butter pecan.
i love vanilla ice cream, but my sister likes butter pecan.
i love vanilla ice cream, however; my sister likes butter pecan.
i love vanilla ice cream, however, my sister likes butter pecan

Which sentence corrects the error in pronoun-antecedent agreement? new team members should pick up his or her jersey from the activities office. if a team member is unable to attend a practice, he or she must provide a doctor's note. if students wish to compete, he or she must maintain a grade point average above 2.5. students are not permitted to attend away games without the consent of her parents or guardians.