Which of the following is one of the four main commands of the RAF?

The correct answer is A. No. 1 Group, which is indeed one of the four main commands of the Royal Air Force (RAF). The RAF is organized into several groups that align with specific operational roles and responsibilities. No. 1 Group typically focuses on air combat operations and oversees various squadrons that specialize in fighter aircraft.

In contrast, the other options do not represent main commands. No. 2 Wing and No. 4 Squadron are examples of subordinate levels within the RAF structure, generally functioning under the oversight of larger groups or commands. No. 3 Division is similarly a divisional structure rather than a main command. Understanding the hierarchical organization of the RAF is critical for recognizing how different units contribute to its overall mission.