Which of the following sentences is punctuated correctly?
Romeo thought he knew who he planned to vote for; however, he decided to watch all the debates just to be sure.
Romeo thought he knew who he planned to vote for; however he decided to watch all the debates just to be sure
Romeo thought he knew who he planned to vote for however; he decided to watch all the debates just to be sure.
Romeo, thought he knew who he planned to vote for, however, he decided to watch all the debates, just to be sure.