Respuesta :
Answer: a.natural active immunization
Explanation:
Immunization or vaccination is a process that protects the living beings from diseases by introduction of vaccine into the body that is efficient enough to trigger the immune response to fight against the disease causing microbe. Active immunization is the induction of immunity after introduction of a foreign antigen in the body.
The vaccine is a natural active immunization because of the fact that the formulation of vaccine includes the microorganism that mimic the one already present in the body causing disease causing symptoms.
