What is the purpose of the training data set?

An analyst has a sufficient volume of data to perform a 3-way partition of the data into training, validation, and test sets to perform honest assessment during the model building process.

What is the purpose of the training data set?
A . To provide an unbiased measure of assessment for the final model.
B . To compare models and select and fine-tune the final model.
C . To reduce total sample size to make computations more efficient.
D . To build the predictive models.

Answer: A