If P(A)=0.6,P(B)=0.3 and P(A∩B)=0.25, which one of the following statements is true about the events A and B?
a) They are independent.
b) They are mutually exclusive.
c) They are not independent because P(A∩B)=P(A)P(B).
d) The given data are insufficient to decide independence.