Which scenario best describes artificially acquired active immunity?

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Artificially acquired active immunity is immunity that the body develops after the immune system is deliberately exposed to an antigen through vaccination. The vaccine introduces a harmless form or component of a pathogen, enough to stimulate the adaptive immune response and lead to the production of specific B and T cells and the buildup of immunological memory. This memory lets the person mount a rapid and strong response if they encounter the real pathogen later, providing long-lasting protection without having the disease itself.

This differs from natural active immunity, where the immune system responds to a real infection. It also differs from natural passive immunity, where antibodies are transferred from mother to fetus and there isn’t a new activation of the child’s own immune memory. And it differs from artificial passive immunity, where ready-made antibodies are given directly and memory isn’t formed.