When considering the configuration of air-handling unit fans, what are the characteristics and considerations associated with draw-through and blow-through units, and what are the types of fans that can be used in these setups (Section 8.5)? Select one: A. Draw-through units and blow-through units have similar characteristics and do not have significant differences in terms of construction cost or noise levels. Return air fans are always installed separately in the ductwork and cannot be part of the air-handling unit. B. None of these C. Draw-through units are generally more expansive and require higher power for refrigeration equipment due to the heat produced by the fan upstream of the cooling coil. Blow-through units promote air mixing upstream of the coils but require special provisions like diffuser plates or screens for even airflow distribution if centrifugal fans are used. Return air fans can be centrifugal, axial, or plenum fans and may be installed separately in the ductwork upstream of the unit. D. Draw-through units are generally larger and promote air mixing upstream of the coils, requiring special provisions for even airflow distribution. Blow-through units are less expensive but tend to have noisier ducts due to the proximity of the fans to the