Which  one  of  the  following  statements is correct in relation to the Indian Air Force?

• A. It has bases in many friendly countries.
• B. It  does  not  carry  out  joint  exercises with any country.
• C. It    has    a    separate    Maintenance Command.
• D. No  officer  has  ever been  elevated  to the  rank  of  Marshal  of  the  Indian  Air Force.