Q. Consider the following statements:1. Caffeine,a constituent  of tea and coffee is a diuretic.2. Citric acid is used in soft drinks.3. Ascorbic acid is essential for the formation of bones and teeth.4. Citric acid is a good substitution for ascorbic acid in our nutrition.which of the statements given above are correct ? 

1. 1 and 2 only
2. 1,2 and 3 only
3. 3 and 4 only
4. 1,2,3 and 4