Which of the following describes independent events A and B?
1) P(A)=0.70 P(B)=0.70 P(A and B)=0.40

2) P(A)=0.40
P(B)=0.70
P(A and B)=0.28

3) P(A)=0.40
P(B)=0.00
P(A and B)=0.40

4) P(A)=0.70 P(B)=0.40
P(A and B)=0.30