Q. Given below are two statements,one labelled as Assertion (A) and other labelled as Reason (R):Assertion (A): Transformer is useful for stepping up or stepping down voltages.Reason (R): Transformer is a device used in D.C. circuits. 

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