North is at the top of this map. North-south streets, west to east: 1st, 2nd, 3rd, 4th Street. East-west avenues, north to south: Alder, Birch, Cedar, Dogwood Avenue. All streets are two-way, none is closed, and all traffic laws must be observed. Engine 4 is at 1st Street and Cedar Avenue and is dispatched to 3rd Street and Alder Avenue. Which is the shortest and most direct legal route?