Consider the following statements with respect to Formaldehyde :
1. Formaldehyde solution can be used to increase the shelf life of fresh food.
2 It occurs naturally in plants and animals.
3. It is considered carcinogenic and exposure for long can cause cancer.
Which of the statements given above are correct?
1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only
4. 1, 2 and 3
5. Answer not known