Explanation:

All codes are correct.

• The concept of 'basic structure' came into existence in the landmark judgment in Kesavananda Bharati vs State of Kerala case (1973).

• Though the term Basic structure is not mentioned and defined in constitution but the elements of basic structured evolved  in different judgment of super court

Some of the elements of Basic Structure as declared by Supreme court are

• The supremacy of the Constitution

• Republican and Democratic forms of Government

• Secular character of the Constitution

• Separation of Powers between the legislature, the Executive, and the Judiciary

• Federal Character of the Constitution

• The sovereignty of India

• The democratic character of the polity

• The unity of the country

• Freedom and dignity of the individual

Hence option 4th is correct.