Question: Is it correct? or it should be the 4th option?? Q6 Consider a DataFrame df. We want to create groups based on the column group_key

Is it correct? or it should be the 4th option??

Q6 Consider a DataFrame df. We want to create groups based on the column group_key in the DataFrame and fill the nan values with group means using: filling_mean = lambda g: g.fillna(g.mean()) Which of the following is correct for performing this task? Odf.groupby(group_key).apply(filling_mean) Odf.groupby(group_key).filling_mean() Odf.groupby(group_key).aggregate(filling_mean) Odf.groupby(group_key).transform(filling_mean)

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