Which of the following is not a method of ex situ conservation?

Ex-situ conservation is off-site conservation in which the animals are conserved in a protected environment under special care. It is conservation of selected rare plants/animals in places outside their natural homes. Ex-situ conservation includes offsite botanical gardens, zoo, seed banks, micropropagation, cryopreservation, In vitro fertilization, etc. An area where animal habitats and their surroundings are protected from any sort of disturbance is known as in situ conservation, National parks are examples of this.