In order to perform honest assessment on a predictive model, what is an acceptable division between training, validation, and testing data?

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In order to perform honest assessment on a predictive model, what is an acceptable division between training, validation, and testing data?
A . Training: 50% Validation: 0% Testing: 50%
B . Training: 100% Validation: 0% Testing: 0%
C . Training: 0% Validation: 100% Testing: 0%
D . Training: 50% Validation: 50% Testing: 0%

Answer: D