What code below is the same as: df[['data']].groupby(df['key']).mean() Question 18 options: df.groupby[['key', 'data']].mean() df.groupby('key')[['data']].mean() df.groupby('key')['data'].mean()

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What code below is the same as: df[['data']].groupby(df['key']).mean() Question 18 options: df.groupby[['key', 'data']].mean() df.groupby('key')[['data']].mean() df.groupby('key')['data'].mean()

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