Which of the following is a formal definition?

Genetically modified organisms are those that have been changed in order to produce desirable characteristics, such as disease and pest
resistance

A genetically modified organism (noun) is defined by the World Health Organization as an "organism (ie, plants, animals, or
microorganisms) in which the genetic material (DNA) has been altered in a way that does not occur naturally by mating and/or natural
recombination."

Genetically modified organisms, also called GMOs, are under scrutiny as a food source. Opponents say that too little research has been done
on the effects of GMOs on humans and on the environment.

A genetically modified organism is one whose genes have been altered. Genes from one species are inserted into a second species. The goal
of this process is to introduce a desired trait or characteristic into the second species.