The following figure depicts training and validation curves of a learner with increasing model

complexity $[6$ Marks$]$

A$.$ Which of the curves is more likely to be the training error and which is more likely to

be the validation error? Indicate on the graph by fill ing in the dotted lines.

B$.$ In which regions of the graph are bias and variance low and high? Indicate clearly on

the graph with four labels: "low variance", "high variance", "low bias", "high bias".

C$.$ In which regions does the model overfit or underfit? Indicate clearly on the graph by

labeling "overfit" and "underfit."