Consider the following statements: In psychrometry, wet-bulb temperature is a measure enthalpy of moist air, so that in the psychrometric chart: 1. The constant enthalpy lines are also constant bulb temperature lines. 2. The wet-bulb and dry bulb temperature are same at any condition 3. The wet-bulb and dry-bulb temperature are equal at saturation condition. Of these statements:

• A. 1 alone is correct       
• B. 1 and 2 are correct                   
• C. 1 and 3 are correct                    
• D. 2 and 3 are correct