Explanation:

Third statement is incorrect. The Supreme Court is yet to define or clarify as to what constitutes the ‘basic structure’ of the Constitution. From the various judgments, the following have emerged as ‘basic features’ of the Constitution or elements / components / ingredients of the ‘basic structure’ of the constitution:
1. Supremacy of the Constitution
2. Sovereign, democratic and republican nature of the Indian polity
3. Secular character of the Constitution
4. Separation of powers between the legislature, the executive and the judiciary
5. Federal character of the Constitution
6. Unity and integrity of the nation
7. Welfare state (socio-economic justice)
8. Judicial review
9. Freedom and dignity of the individual
10. Parliamentary system
11. Rule of law
12. Harmony and balance between Fundamental Rights and Directive Principles
13. Principle of equality
14. Free and fair elections
15. Independence of Judiciary
16. Limited power of Parliament to amend the Constitution
17. Effective access to justice
18. Principles (or essence) underlying fundamental rights.
19. Powers of the Supreme Court under Articles 32, 136, 141 and 142
20. Powers of the High Court’s under Articles 226 and 227

The Basic Structure Doctrine evolved in the Kesavananda case ensures that Parliament while amending the constitution does not alter certain of its features which are fundamental to the Constitution like separation of powers, judicial independence etc.