Consider the following statements:
1. The work of compressor in vapor compression refrigeration system increases with superheat of the suction vapor.
2. The work of compressor depends on the pressure difference rather than the temperature difference of evaporator and condenser.
3. The coefficient of performance is within the range of 3 to 6 except at very low temperature when it may be less than 1.
Which of the statements given above are correct?
(a) 1, 2 and 3 (b) 1 and 2 only
(c) 1 and 3 only (d) 2 and 3 only