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df is a Pandas data frame with three columns, all numeric. You use z-score normalization to normalize each of the columns. Which of the following

df is a Pandas data frame with three columns, all numeric. You use z-score normalization to normalize each of the columns. Which of the following expressions would you use to check that your normalization was successful? Choose the correct choice

df.mean()
df.max()
df.columns

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