Which one of the following is correct?

The Indian Army is structured into various Arms and Services. The Army has its own Corps of Army Air Defence, which originated from the Artillery and provides protection against enemy air attacks. Option 1 is incorrect because the Mechanised Infantry Regiment (MIR) is a distinct, relatively new structure established in 1979 to bridge the gap between conventional infantry and armoured forces. Option 2 is incorrect as the Corps of Electrical and Mechanical Engineers (EME) is a separate entity responsible for repairing and maintaining electrical and mechanical devices, distinct from the Corps of Engineers. Option 3 is incorrect because the Army Medical Corps (AMC) and Army Dental Corps (ADC) are independent services providing healthcare and oral health services, respectively, and are not divisions of the Army Service Corps (ASC), which handles logistics and supplies.