Some people say that complete selflessness has two meanings: first, the practice of serving others unconditionally; and second, the refusal to serve others. Which of the following is a logical inference of the above point:. ['No one is completely selfless.', 'It is impossible for all people to be completely selfless.', 'If someone receives the services of others, then there must be a completely selfless person.', 'If someone refuses the service of others, then there must be a completely selfless person.']