Huawei precision cooling logic separates heater enablement into distinct control strategies to avoid unnecessary heating and to keep humidity control stable. In Low temperature heating, the heater is governed purely by the room temperature control demand: if temperature is below the heating threshold (or below setpoint with heating conditions met), the heater can start regardless of whether dehumidification is enabled, which matches statement D. In Dehumidification heating, the heater is not a general low-temperature heater; it is an auxiliary function used to prevent overcooling during dehumidification and to maintain temperature while the unit dehumidifies. Therefore, the heater in this mode is permitted to start only when the dehumidification function is active and temperature conditions require compensation, which matches statement B. Statement C is false because it incorrectly claims that any of the three selections will start heating automatically whenever room temperature is low; that is not true for ''Dehumidification heating'' unless dehumidification is actually enabled and running.