Consider the following statements:
For a large aviation gas turbine, an axial flow compressor is usually preferred over centrifugal compressor because
1. The maximum efficiency is higher.
2. The frontal area is lower.
3. The pressure rise per stage is more.
4. The cost is lower.
Which of the statements given above are correct?
(a )1 and 4 b. Only 1 and 2
c. 1, 2 and 3 d. 2, 3 and 4