Define target leakage.

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Part $1$

A$.$

Target leakage refers to acquiring any necessary personal information associated with a data set. It could include$$ "scraping" data from websites$($under the terms of the particular$$ website$)$ or purchasing the personal data from a$$ third$-$party.

B$.$

The term target leakage refers to any activity that reveals deeper insight into a dataset. This activity may include numeric$$ analysis, such as finding the$$ mean, median,$$ minimum, and maximum values for a feature like annual income.

C$.$

Target leakage refers to past and present data that for one reason or another is purposefully omitted from the analysis.

D$.$

Target leakage refers to data that are not available at the time of the analysis and that therefore should be excluded.