Which of the following describes immunity produced by the injection of a vaccine?

The answer is active immunity because it specifically refers to the type of immunity generated when the body is exposed to a vaccine. When a vaccine is administered, it introduces a component of a pathogen (such as a protein or a weakened form of the virus) to the immune system. This exposure stimulates the immune response, leading to the production of antibodies and the activation of memory cells. These memory cells remain in the body to provide long-lasting protection against future infections from the actual pathogen.

In contrast, passive immunity involves the transfer of antibodies from one individual to another, providing temporary protection. Natural immunity occurs when an individual is exposed to a pathogen and their immune system responds without the aid of vaccines, leading to the development of immunity through infection. Acquired immunity is a broader term that encompasses both active and passive immunity. However, in the context of the question, the most accurate description of immunity produced specifically by vaccination is active immunity.