Q. Consider the following statements in respect of a jet engine and a rocket:1. A jet engine uses the surrounding air for its oxygen supply and so is unsitable for motion in space.2. A rocket carries its own supply of oxygen in the gas form,and fuel.Which of the statements given above is/are correct ? 

1. 1 only
2. 2 only
3. Both 1 and 2
4. Neither 1 nor 2