An insurance customer installs two BladeCenter chassis in a rack with glass doors. After a short time, the blowers in both BladeCenters increase to full speed, and then one fails. Apart from replacing the broken blower, which additional action is required for a long term fix of the following?()
A、Add Rear Door HeateXchanger
B、Add fans to the top of the racks
C、Increase circulation from Data Center raised floor
D、Change to perforated doors