निम्नलिखित में से कौन सा प्राचीन स्थल भारत की आधुनिक भौगोलिक सीमाओं के भीतर स्थित नहीं 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?