Two people, G and H, were each given an injection to protect them against a particular pathogen. One person was injected with antibodies. The other person was injected with a vaccine. The graph shows the concentrations of the antibody against this pathogen in the blood of the two people, G and H, over a period of 20 days following the injection. Which row correctly describes the type of immunity shown by G and H? [Figure 40.1]

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