The correct answer is option 3 - Epistolary Jurisdiction. Public Interest Litigation (PIL) involves cases that are brought before the courts for the protection of public interest or for the enforcement of the rights of the disadvantaged. In India, PIL is typically filed in the higher courts, such as the High Courts and the Supreme Court.

Option 1 - Original Jurisdiction refers to the authority of a court to hear a case for the first time. While PIL cases can be filed under the original jurisdiction, it does not specifically cover PIL.

Option 2 - Appellate Jurisdiction refers to the authority of a higher court to review and revise the decisions of a lower court. While PIL cases can be appealed to higher courts, it does not specifically cover PIL.

Option 3 - Epistolary Jurisdiction refers to the authority of a court to take up cases based on letters or correspondence received by the court. PIL cases often arise from letters or complaints received by the court, making this option the correct answer.

Option 4 - Advisory Jurisdiction refers to the authority of a court to provide advisory opinions or give advice on legal matters. This does not directly relate to the concept of PIL.

In conclusion, it is the Epistolary Jurisdiction of the Indian Judiciary