समुद्रगुप्त की उपलब्धियां एक लंबे शिलालेख में दर्ज हैं, जिसे प्रयाग प्रशस्ति कहा जाता है, इसकी रचना उनके दरबारी कवि _____________ द्वारा की गई थी।

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?