Consider the following statements:
When a GSHE line is extended, it may strike the saturation curve at a point. This point is called
1. Effective surface temperature.
2. Air saturation temperature.
3. Water boiling temperature.
4. Apparatus dew point.
Which of the statements given above are correct?
(a) 1 and 2 (b) 1 and 4
(c) 2 and 3 (d) 3 and 4