Passive and active immunization

Question

What is the main difference between passive and active immunization?

Answer 1

A) Passive immunization is less expensive than active immunization.

Answer 2

B) Active immunization is used in emergencies, while passive immunization is used for long-term prevention.

Answer 3

C) Passive immunization requires the administration of preformed antibodies, while active immunization stimulates the body to produce antibodies.

Answer 4

D) Passive immunization is short term, while active immunization is long term.

Answer 5

E) Passive immunization is less effective than active immunization.