Consider the following statements regarding the axial flow in an air compressor:
1. Surging is a local phenomenon while stalling affects the entire compressor.
2. Stalling is a local phenomenon while surging affects the entire compressor.
3. The pressure ratio of an axial compressor stage is smaller than that of a centrifugal compressor stage.
Which of these statements are correct?
(a) 1,2 and 3 (b) 1 and 2
(C) 2 and 3 (d) 1 and 3