challenge: During which administrations did Abdirahman Haji Mumin serve as Defence Minister?
  
  A. Aden Adde and Siad Barre
  B. Abdullahi Isa and Siad Barre
  C. Abdullahi Isa and Aden Adde
  D. Abdullahi Isa and Mohamed Siad Barre
  Answer: 