निम्नलिखित में से किसने कहा था कि 'मौर्य राजा आमतौर पर सशस्त्र महिलाओं से घिरे होते थे'?

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?