Which of the following statements regarding literacy in India are correct ? 1. A person who can only read but cannot write is not defined literate. 2. Children below 5 years of age are not taken into consideration even if they are able to read and write. 3. For the purpose of census, a person is deemed literate if he or she can read and write with understanding in any of the 22 languages mentioned in the Constitution 4. The fact that a district has attained hundred percent literacy does not mean that the entire population in the district is literate.