Which of the Following Statements A), B) or C) Is

Which of the following statements a) , b) or c) is false?

A) In real-world machine-learning applications, it can often take minutes, hours, days or even months to train your models-special-purpose, high-performance hardware called GPUs and TPUs can significantly reduce model training time.
B) The fit method returns the estimator object.
C) For simplicity, we generally use the default estimator settings-by default, a KNeighborsClassifier looks at the three nearest neighbors to make its predictions.
D) All of the above statements are true.