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What is holdout data?

What is holdout data?
A . a subset of the provided data set selected at random and used to validate the model
B . a subset of the provided data set selected at random and used to initially construct the model
C . a subset of the provided data set that is removed by the data scientist because it contains data errors
D . a subset of the provided data set that is removed by the data scientist because it contains outliers

Answer: A

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