The selectmen shall include as part of the warrant for the annual town meeting a warrant for each annual town election which shall prescribe the place, day and hour of the election, the officers to be elected, and the questions to be submitted to the voters. In a town which has adopted an official ballot system for the election of town officers, the warrant shall specify the time the polls are open and the hour before which the polls may not close. The warrant shall clearly specify which items shall be voted on by ballot at the town election and which items shall be considered at the town business meeting. In a town which has not adopted an official ballot system, it shall be sufficient for a town meeting warrant to list items to be taken up at the town business meeting, including the election of town officers.