The desired level (and kind) of control depends on the whatever problem you are trying to solve. Configuration A is delivered without a humidity sensor which means you won’t be able to control for humidity unless you are connecting an external operation-signal from, for example a hygrostat. For configurations B and C, the dehumidifier is delivered with a humidity sensor capable of controlling the dehumidifier according to your setpoint.
To decide the appropriate control option for your unit, please consult with your local reseller.