Which of the following pairs of engine and performance/ characteristic is/.are correctly matched?
1. Turbo- jet : Efficiency increases with fligh speed
2. SI engine : Lowest specific fuel consumption
3. Turbo- prop: Suitable for low flight speeds
Select the correct answer using the codes given below
(a) 1 and 2 (b)2 and 3
(c) 1 and 3 (d)2 alone