दक्षिण-पूर्वी राजस्थान में स्थित प्रमुख ताम्र-पाषाणिक पुरास्थल निम्नलिखित में से कौन सा है?

In Ancient Indian Statecraft, Kautilya's 'Rajamandala' theory primarily deals with:

The First Buddhist Council was held at ______.

Which ancient Indian text contains references indicating that population counts or census-like records were maintained in ancient India?