Explanation:

Our Constitution ensures that persons accused of various offences would also get sufficient protection. We often tend to believe that anyone who is charged with some offence is guilty. However, no one is guilty unless the court has found that person guilty of an offence. It is also necessary that a person accused of any crime should get adequate opportunity to defend herself or himself. To ensure a fair trial in courts, the Constitution has provided three rights: • no person would be punished for the same offence more than once. Hence, Statement 1 is correct. • No criminal law shall declare any action as illegal from a backdate. Hence, Statement 2 is correct. • no person shall be asked to give evidence against himself or herself. Hence, Statement 3 is incorrect