The first-type vaccine is a vaccine that must be vaccinated by the country according to the current domestic epidemic situation and the general physical conditions of Chinese children. Therefore, parents generally believe that the second vaccine is only to prevent diseases other than the first vaccine. Which of the following best refutes parents' views? ['The pentavalent vaccine in the second class vaccine can prevent some diseases covered by the first-class vaccine, so it can reduce the number of vaccination.', 'Type I vaccines prevent diseases that can cause greater harm to children, while type II vaccines are not necessarily.', 'The same vaccine may belong to different types of vaccines in different countries and regions.', 'In addition to economic reasons, the choice of not receiving a second-class vaccine has its safety considerations.']