Who was the Chief Justice of India when Public Interest Litigation (PIL) was introduced in the Indian Judicial System?

Who was the Chief Justice of India when Public Interest litigation was introduced in the Indian Judicial System?

Who among the following was the Chief Justice of India when Public Interest Litigation (PIL) was introduced in the Indian Judicial System?

Where can the Public Interest Litigation (PIL) be filed?

Where the Public Interest Litigation (PIL) can be filed?

Who was the Chief Justice of India for the shortest duration?