(i)A doctor would recommend preformed antibodies in an injured person in an accident on snake bites and tetanus.  The type of immunization is passive immunization. Its advantages are: (a)Provides immediate relief. (b)Used either prophylactically or therapeutically. (ii)This type of immunity is called active immunity. In this, the preparation of antigenic proteins of pathogen or inactivated/weakened pathogens (vaccine) are introduced into the body. It is a slow process as takes time to develop antibodies against the antigen