Consider the following statements: The typical air velocities in the ducts of air- conditioning systems are: 1. Lower in residential buildings as compared to those of public buildings 2. higher in residential buildings as compared to those of public buildings 3. Higher in industrial buildings has compared to those of public buildings 4. Equal in all types of buildings Which of these statements is/are correct?

• A. 1 alone
• B. 1 and 3
• C. 2 and 3
• D. 4 alone