Question: Which line of code will group dataframe df by categories of variable x, and then print the maximum values of variable y for each group?

Which line of code will group dataframe df by categories of variable x, and then print the maximum values of variable y for each group?

df.max().groupby(x)[y]

df.max().groupby(y)[x]

df.groupby(x)[y].max()

df.groupby(x).max()

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