Correctly measuring the productivity of service workers is complex. Consider, for example, postal workers: they are often said to be more productive if more letters are delivered per postal worker. But is this really true? What if more letters are lost or delayed per worker at the same time that more are delivered? The objection implied above to the productivity measure described is based on doubts about the truth of which of the following statements? ['The delivery of letters is the primary activity of the postal service.', 'Postal workers are representative of service workers in general.', 'The quality of services rendered can appropriately be ignored in computing productivity.', 'The number of letters delivered is relevant to measuring the productivity of postal workers.']