The question asks for the most complete answer regarding operations that can return a DataFrame with no duplicate rows. The methods DataFrame.distinct(), DataFrame.dropDuplicates(), and DataFrame.drop_duplicates() are all capable of achieving this. DataFrame.distinct() removes duplicate rows based on all columns, while DataFrame.dropDuplicates() and its alias DataFrame.drop_duplicates() can also remove duplicates, with the latter being more Pythonic. Therefore, option E, which includes all three methods, is the most complete and correct answer.