Q. Given below are two statements,one labelled as Assertion (A) and other labelled as Reason (R):Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape.Reason (R): The refracrive index of diamond is less than of glass. In context of the 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