Since the rulers of the empire were aware of their military weakness, they first adapted the practices of former civilizations and developed their own way of diplomacy with their political and cultural contributions. For example, they adapted the practices of protocol and dynastic marriages from the Near Eastern civilization, oration as a tool for public speaking from Greece, and the divide and rule tactics from the Roman Empire. In this manner the diplomatic methods they exercised were ranging from the, formation of alliances to dynastic marriages, from exploiting the enemy’s weaknesses, to deception and the use of religion. The correct answer is E.