challenge: What are the two variants of the Sayyad armoured fighting vehicle?
  
  A. One with a single or a double cannon turret and the other with a single or a double mortar launcher
  B. One with a single or a double anti-aircraft missile launcher and the other with a single or a double recoilless rifle
  C. One with a single or a double machine gun turret and the other with a single or a double anti-aircraft gun
  D. One with either a single or a double Toophan anti-tank missile launcher and the other with a multiple rocket launcher
  Answer: 