As compare to turbo- prop, a turbo- jet

Question

 Consider the following statements:

As compare to turbo- prop, a turbo- jet

1. Can operate at higher attitudes
2. Can operate at higher flight velocities.                
3.  Is more fuel efficient at lower speeds.

Which of these statements are correct?

(a) 1,2 and 3                (b) 1 and 2

(c) 2 and 3                   (d) 1 and 3