Which of the following is correct in respect of the concept of "Basic Structure"?

Basic structure means those basic characters/attributes which are enshrined in the heart of the Constitution and which cannot be repealed/ replaced by any Parliament. It is a bundle of characteristics of the Indian Constitution which can never lose their relevance and can never be derogated. Preamble of the Constitution is a part of basic structure. All of the above.

All of the above.

Basic structure means those basic characters/attributes which are enshrined in the heart of the Constitution and which cannot be repealed/ replaced by any Parliament. Hence, it is a bundle of characteristics of the Indian Constitution which can never lose their relevance and can never be derogated