People G and H each received an injection intended to protect them from a specific pathogen. One of them was given antibodies by injection. The other was given a vaccine by injection. The graph shows how the concentration of the antibody against this pathogen in the blood of G and H changes during the 20 days after the injection. Which row gives the correct description of the type of immunity shown by G and H?
- AG: artificial active immunity; H: artificial passive immunity
- BG: artificial passive immunity; H: artificial active immunity
- CG: natural active immunity; H: natural passive immunity
- DG: natural passive immunity; H: artificial active immunity