Correct Option (d):
The Supreme Court of India is designated as the guardian and custodian of the Constitution of India. Its primary role involves the interpretation, protection, and enforcement of constitutional provisions.
The Court's powers in this regard include:
- Enforcement of Fundamental Rights: Under Article 32, it can issue various writs (Habeas Corpus, Mandamus, Prohibition, Quo Warranto, Certiorari) to protect these rights.
- Resolution of Constitutional Disputes: Articles 131, 132, and 136 empower the Supreme Court to adjudicate disputes involving constitutional questions and interpret the Constitution.
- Judicial Review: It possesses the power to review legislative and executive actions to determine their constitutionality.
- Basic Structure Doctrine: The landmark Kesavananda Bharati v. State of Kerala (1973) case established this doctrine, affirming the Court's authority to prevent amendments that alter the fundamental framework of the Constitution, thereby safeguarding its core identity.
Incorrect Options:
The President of India (a) is the constitutional head of the executive and a part of the Union Legislature. While the President takes an oath to preserve, protect, and defend the Constitution, their role is not that of its ultimate interpreter or custodian. The power of judicial review and final constitutional interpretation rests with the judiciary.
The Prime Minister of India (b) is the head of the government and leads the executive branch. The Prime Minister's office is responsible for implementing policies in accordance with the Constitution, but it does not hold the mandate to be the custodian or final interpreter of the Constitution.
The Lok Sabha Secretariat (c) is an administrative and support body for the Lok Sabha, its committees, and members. Its function is to facilitate the legislative process and provide administrative services, not to interpret, protect, or act as the custodian of the Constitution.