Option 1 -> Zoo is Ex-Situ conservation where animals are kept in artificial habitats outside their natural environment.
Option 2 -> Botanical Garden is Ex-Situ conservation where plants are cultivated and preserved outside their natural habitats.
Option 3 -> Gene Bank is Ex-Situ conservation where genetic material like seeds, tissues, or DNA is preserved in controlled facilities.
Option 4 -> Wildlife Sanctuary is In-Situ conservation where species are protected within their natural habitats and ecosystems.
Hence, Wildlife Sanctuary -> It represents In-Situ conservation where biodiversity is conserved in natural habitats, unlike the other three options which involve conservation outside natural environments -> correct