Q. Consider the following statements:Assertion (A) :Existence of human life on Venus is highly improbable.Reason (R) : Venus has extremely high level of carbon dioxide in its atmosphere.In the context of above two statements, Which one of the following is correct ?   

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true