What is a benefit to performing data cleansing (imputation, transformations, etc.) on data after partitioning the data for honest assessment as opposed to performing the data cleansing prior to partitioning the data?
A . It makes inference on the model possible.
B . It is computationally easier and requires less time.
C . It omits the training (and test) data sets from the benefits of the cleansing methods.
D . It allows for the determination of the effectiveness of the cleansing method.
Answer: D