Which of the following correctly defines a transgenic animal?

A transgenic animal is defined as an organism that has been genetically modified to contain and express one or more foreign genes. These modifications are made using sophisticated genetic engineering techniques, resulting in animals that can exhibit new traits or characteristics, which may not naturally occur within the species. This definition encapsulates the core purpose of creating transgenic animals: to investigate gene function, model human diseases, or enhance desirable traits for agricultural purposes.