Which one of the following is not included under in situ conservation?

In situ conservation is the conservation of genetic resources in natural populations of plant and animal species, such as forest genetic resources  in natural populations of tree species. It is the process of protecting a endangered plant or animal species in its natural  habitat, either by protecting or cleaning up the habitat itself, or by defending the species fro predators. It is applied to conservation of agricultural biodiversity in  agroecosystemsby farmers, especially those using unconventional farming practices. A Botinical Garden is a place where a wide variety of plants are cultivated for scientific, educational, and ornamental purposes, often including a library, a herbarium, and greenhouses;  & an arboretum.Originally, a collection of living plants designed to illustrate relationships within plant groups. Most modern botanical gardens are concerned primarily with exhibiting ornamental plants in a scheme that emphasizes natural relationships. A display garden of mostly woody plants (shrubs and trees) is often called an arboretum The botanical garden as an institution can be traced to ancient China and many Mediterranean countries, where such gardens were often centers for raising plants used for food and medicines. Botanical gardens are also reservoirs of valuable heritable characteristics, potentially important in the breeding of new varieties of plants. Still another function is the training of gardeners. The world's most famous botanical garden is Kew Gardens.