Select 3 features of IBM’s CoolBlue Energy Management Innovation：（） A: IBM Active Energy Manager， Calibrated Vectored Cooling， and Water Chilled Door eXchanger   B: IBM Active Energy Manager， Front Door Heat eXchanger， and Calibrated Vectored Cooling C: Power Configurator， Calibrated Vectored Cooling， and Rear Door Heat eXchanger D: Thermal Diagnostics， Front Door Heat eXchanger， and Rear Door Heat eXchanger