Pair 1 is incorrect: A Brigadier (Army) is equivalent to an Air Commodore (Air Force) and a Commodore (Navy). A Commander in the Navy is actually two ranks junior to a Brigadier. Pair 2 is incorrect: A Major General (Army) is equivalent to an Air Vice Marshal (Air Force) and a Rear Admiral (Navy). A Vice Admiral is a rank higher (equivalent to a Lieutenant General). Pair 3 is correct: A Major (Army) is equivalent to a Squadron Leader (Air Force) and a Lieutenant Commander (Navy). Pair 4 is incorrect: A Lieutenant Colonel (Army) is equivalent to a Wing Commander (Air Force) and a Commander (Navy). A Group Captain and Captain (Navy) are equivalent to a Colonel in the Army. The correct equivalent rank in the three services of Indian Defence forces are: | Indian Army | Indian Navy | Indian Air Force |
| --------------- | ---------------------- | -------------------------- |
| Field Marshal | Admiral of the fleet | Marshal of the Air Force |
| General | Admiral | Air Chief Marshal |
| Lt. General | Vice Admiral | Air Marshal |
| Major General | Rear Admiral | Air Vice Marshal |
| Brigadier | Commodore | Air Commodore |
| Colonel | Captain | Group Captain |
| Lt. Colonel | Commander | Wing Commander |
| Major | Lt. Commander | Squadron Leader |
| Captain | Lieutenant | Flight Lieutenant |
| Lieutenant | Sub Lieutenant | Flying Officer | Thus only pair 3 is correctly matched, hence option D is the correct answer