Pick up the correct statement from the following:

Question: Pick up the correct statement from the following:

1.Blistering may be cured by applying water paint finished with oil paint dried with a little copal varnish

2.Cracked paints may be cured by removing paint and giving a fresh coat of paint

3. Crawling paints may be cured by sand preparing the surface and giving a fresh coat with plenty of turps

4.All the above.

Answer:4