Question: Consider the DataFrame df = pd . DataFrame ( [ [ i - j + 3 for i in range ( j + 1 )

Consider the DataFrame
df = pd.DataFrame([[i-j+3 for i in range(j+1)] for j in range(6)])
Which of the following will return a DataFrame where no entries are null valued.
df.fillna(method='ffill')
df.fillna(method='bfill')
df.fillna(method='ffill', axis =1)
df.fillna(method='bfill', axis =1)

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