What is the primary purpose of the Partition node in a modeling effort?

What is the primary purpose of the Partition node in a modeling effort?
A .  Divide the data into training and testing data.
B .  Increase the proportion of under-represented subgroups within the data.
C .  Decrease the proportion of an over-represented subgroup within the data.
D .  Allow for equal sampling across subgroups within the data.

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Answer: A