Which of the following statements describes an overfitted model the best. a. Performs worse on training data as the training process proceeds, while performing better on a held-out test data b. Its performance doesn't improve by additional training neither on the training data nor on the test data c. Performs better on training data as the training process proceeds, while performing worse on a held-out test data d. Performs worse on both the training data and the test data as the training process proceeds.