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Which of the following built-in functions has optional arguments-not just keyword arguments, where an argument can be excluded to obtain a default value? Select all that apply O a.sum cross ou b.open0 C.print d. pow0 e.round D f.hash0 cross our cross out cross ou cross out cross out One of the following references can be rebound to another object in memory. Choose one correct answer Select one: True 42.0 False cross out cross out cross out cross out None nine Hello cross out cross out cross out