Telephone companies across the country are currently starting to provide consumers with electronic operator systems. However, in the near term, manual operators will not be reduced. Except which of the following, all other things help explain the above phenomenon? ['The number of telephones that need help from operators has skyrocketed.', 'Although it has been tested, the new electronic operator system needs further adjustments to fully function.', 'If the manual operator is fired during the current contract period, the relevant party will be liable.', 'The new electronic operator is twice as efficient as a manual operator.']