Which of the following best describes artificially acquired passive immunity?

Artificially acquired passive immunity is characterized by providing immediate but temporary protection against pathogens through the administration of antibodies, typically via injections. This type of immunity does not involve the individual's immune system generating a response but rather relies on the introduction of pre-formed antibodies to combat infections. For example, antiserums and immunoglobulin injections can offer short-term defense against certain diseases, as the antibodies provided can act quickly to neutralize pathogens.

The other choices describe different forms of immunity. Natural exposure to a pathogen refers to the body's own immune response following infection, which leads to the development of immunity. Vaccination involves stimulating the immune system to create its own antibodies, thereby providing a long-lasting immune response. Long-lasting immunity from exposure typically refers to the immune memory developed after overcoming an infection, which allows for a quicker response to the same pathogen in the future. Thus, the correct answer highlights the key characteristic of artificially acquired passive immunity as a short-term solution through direct antibody administration.