challenge: What was Khosrow Soltan Armani's role during the Russo-Persian War of 1651-1653?
  
  A. He was a neutral diplomat who brokered a peace treaty between the two sides
  B. He was the governor of the Russian fortress on the Iranian side of the Terek River
  C. He was the leader of the Russian forces
  D. He was a Safavid official and military commander who participated in the successful Safavid offensive
  Answer: 