You observe the following train and test error as a function of model complexity p for three different models: Model A Model B Model C 10 Train error Test error 10 Train error Test error 1.0 Train error Test error 08 08 28 06 0.6 Error Error Error 04 0.4 02 0.2 02 00 00 30 20 Model complexity p 36 Model complexity P Model complexity P Which models, if any, appear to be underfit for all settings of p? Select one: O a. A Ob. B . O d. None