Assertion A: Normally turpentine oil is recommended as thinner for indoor painting
Reason R: Turpentine oil is costlier than other thinners.
Which of the following is correct?
1. A is false but R is true
2. A is true but R is false
3. Both A and R are true, but R is not a correct explanation of A
4. Both A and R are true, and R is the correct explanation of A.