8. Which of the following curve shows the trade-off between true positive rate and false positive rate? a) ORC. b) ROC. c) COR. d) ROC. What is a statistically optimal classifier? a) A classifier which calculates the nearest neighbor for a given test example. b) A classifier which gives the highest variance of making prediction. c) A classifier which minimizes the sum squared error on the training set. d) A classifier which gives the highest bias of making prediction