The term 'State' is defined under Article 12 of the Indian Constitution. It includes the Government and Parliament of India, Government and Legislature of States, and all local or other authorities within the territory of India or under the control of the Government of India.
This article ensures that the state is bound by the fundamental rights in the Constitution, and it is essential in the context of judicial review. The other options are not correct because Article 5 deals with the citizenship of India, Article 13 deals with laws inconsistent with or in derogation of the fundamental rights, and Article 14 deals with the equality before the law.
Thus, the correct answer is Article 12.