Mention the correct chronological sequence of the following Advisory opinions given by the Supreme Court of India under Article 143 of the Constitution of India.<br>1. In re Keshava Singh case<br>2. In re Berubari case<br>3. In re Delhi Laws Act case<br>4. In re the Sea Customs Act case<br>Choose the correct answer:

Correct Answer: 3, 2, 4, 1