You toss a coin twice. Which calculation proves that landing on tails for the first toss and the second toss are independent events?

A) P(A and B) =
1
4
+
1
4
B) P(A and B) =
1
4
−
1
4
C) P(A and B) =
1
2
·
1
2
D) P(A and B) =
1
2
·
1
4