I want to know the answer to the following question:
What did the Arthasastra say a king must use?
All the background I'm provided with is that "Roger Boesche describes the Arthaśāstra as "a book of political realism, a book analysing how the political world does work and not very often stating how it ought to work, a book that frequently discloses to a king what calculating and sometimes brutal measures he must carry out to preserve the state and the common good."". Is that enough to answer the question?
Answer: yes