What Is the Principal Behind Vaccinations

What is the principal behind vaccinations?

A) An inactive or weakened disease-causing agent is injected to stimulate the body to produce antibodies and memory cells.
B) An inactive antigen can stimulate RBC to multiply.
C) Vaccinations stimulate a hyperacute rejection against the infectious agent.
D) Vaccinations contain antibodies that will stay in the body and provide long-term protection against the infectious agent.
E) All viruses and bacteria have identical antigens.

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