Consider the following statements: 1. According to Article 356, Government could declare a state of emergency on grounds of external threat only. 2. Once an emergency is proclaimed, the federal distribution of powers remains practically suspended and all the powers are concentrated in the hands of the Union Government. 3. The 42nd Amendment was also passed during the emergency. 4. Among the various changes made by the 42nd Amendment, one was that the duration of the legislatures in the country was extended from 5 to 7 years. Which of the statements given above is correct?