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In the context of machine learning pipelines utilizing cross-validation, how should the pipeline and cross-validator be arranged when estimators or transformers are involved?
A
Place the cross-validator within the pipeline under all circumstances.
B
For pipelines containing estimators, encapsulate the entire pipeline within the cross-validator.
C
To mitigate data leakage risks, position the pipeline inside the cross-validator.
D
Regardless of the scenario, always embed the pipeline inside the cross-validator.
