Air Breathing Engines

Consider the following statements with reference to the Air Breathing engines:

  1. A ramjet is a form of air-breathing jet engine that uses the vehicle’s forward motion to compress incoming air for combustion without a rotating compressor.
  2. A scramjet engine is an improvement over the ramjet engine as it efficiently operates at hypersonic speeds and allows supersonic combustion.
  3. A dual mode ramjet (DMRJ) is a type of jet engine where a ramjet transforms into scramjet over Mach 4-8 range, which means it can efficiently operate both in subsonic and supersonic combustor modes.

Which of the statement(s) given above is/are correct? Choose the correct answer from the codes given below:

1 and 2
2 and 3
1 and 3
1,2 and 3