Which one of the following is related to ex situ conservation of threatened animal and plants?

Ex situ conservation refers to the conservation of endangered species outside of their natural habitats, such
as in zoos, botanical gardens or wildlife safari parks. These institutions aim to maintain and breed endangered species for conservation purposes, research and education. Therefore, option (4), Wildlife safari parks, is related to ex situ conservation of threatened animals and plants.
(1) Biodiversity hotspots are regions with high levels of biodiversity that are under threat from human activity. They are an example of in situ conservation. 
(2) The Amazon Rainforest is a natural habitat for a diverse range of plant and animal species. It is not an example of ex situ conservation.
(3) The Himalayan region is another important habitat for a diverse range of species. It is not an example of ex situ conservation.