Option 1: The statement that the term `Secular Democratic Republic` was not there in the Preamble originally is correct. The original Preamble of the Constitution of India did not include these specific words. However, through the 42nd Amendment Act in 1976, the term `Secular` was added to the Preamble, emphasizing the secular nature of the Indian state.

Option 2: The statement that the Preamble contains the basic structure of the Constitution of India is correct. The Preamble sets out the fundamental ideals and objectives of the Constitution, which form the foundation of the entire document. It reflects the core principles of justice, liberty, equality, and fraternity, which are vital to the functioning of the Indian democracy.

Option 3: The statement that by itself, the Preamble is not enforceable in a court of law is correct. The Preamble is considered to be a non-justiciable part of the Constitution, meaning that it cannot be used as a basis for legal action in courts. However, it still holds significant importance as an interpretative tool and helps in understanding the spirit of the Constitution.

Option 4: The statement that the Supreme Court has held that the Preamble cannot be considered as an aid to the legal interpretation of