What does the following code do, if df is a DataFrame?
df.fillna(123, inplace=True)

Question

What does the following code do, if df is a DataFrame? 
 df.fillna(123, inplace=True)

Answer

NaN values are replaced with 123 in the entire DataFrame

Answer

None of the answers

Answer

Returns a new DataFrame where all 123 values are changed to True

Answer

The value at row 123 is changed to True

Answer

Returns numeric columns filled with 123

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