The fourth quarter of the San Francisco 49ers' regular season is complete. Now let's look at some key developments as the defending NFC champions sit at 12-4 headed into the playoffs:Story of the quarter: Perfection. The 49ers went 4-0 in the quarter to move up to the No. 5 seed in the playoffs. They bypassed New Orleans, who was the last team to beat San Francisco. It was the second four-game stretch of the season the 49ers went 4-0. It also happened in the second quarter.