Which of the following tables shows a valid probability density function? Select all correct answers. Select all that apply:

x P(X=x)
0 14
1 12
2 18
3 18
x P(X=x)
0 35
1 15
2 −15
3 25
x P(X=x)
0 310
1 15
2 35
3 110
x P(X=x)
0 0.01
1 0.46
2 0.19
x P(X=x)
0 0.09
1 0.24
2 0.67
x P(X=x)
0 14
1 12
2 14