<Table> <Tr> <Th_colspan="2"> 1984 NCAA Division I-A season </Th> </Tr> <Tr> <Th> Number of teams </Th> <Td> 110 </Td> </Tr> <Tr> <Th> Preseason AP No. 1 </Th> <Td> Auburn Tigers </Td> </Tr> <Tr> <Th_colspan="2"> Post-season </Th> </Tr> <Tr> <Th> Duration </Th> <Td> December 15, 1984--January 1, 1985 </Td> </Tr> <Tr> <Th> Bowl games </Th> <Td> 18 </Td> </Tr> <Tr> <Th> Heisman Trophy </Th> <Td> Doug Flutie, Boston College QB </Td> </Tr> <Tr> <Th> Winner </Th> <Td> BYU Cougars </Td> </Tr> <Tr> <Th_colspan="2"> Division I-A football seasons </Th> </Tr> <Tr> <Td_colspan="2"> ← 1983 1985 → </Td> </Tr> </Table> <Tr> <Th_colspan="2"> 1984 NCAA Division I-A season </Th> </Tr>

Who won the 1984 national championship in football