For which of the following does the beta distribution reduces to uniform distribution over \([0,1]\) .
1.\(\alpha=\beta=0\)
2.\(\alpha=\beta=1\)
3.\(\alpha=1 , \beta=0\)
4.\(\alpha=0 , \beta =1\)
5.\(\alpha , \beta > \frac{1}{2}\)
6.\(1>\alpha>\beta>\frac{1}{2}\)