Which of the Following Statements Correctly Describes Vaccines and How

Multiple Choice

Which of the following statements correctly describes vaccines and how they help prevent viral infection?

A) Vaccines are active versions of a virus that stimulate an immune reaction in a person.
B) Vaccines are inactive versions of a virus that stimulate an immune reaction in a person.
C) Vaccines are infectious proteins that stimulate an immune reaction in a person.
D) Vaccines are functional pathogens that stimulate an immune reaction in a person.