The correct option is D International Code of Botanical Nomenclature
International Code of Botanical Nomenclature is the set of rules and recommendations dealing with the formal botanical names that are given to plants, fungi and few other groups of organisms, all those traditionally treated as algae, fungi, or plants.
Botanical nomenclature is independent of zoological, bacteriological and viral nomenclature. A guiding principle in botanical nomenclature is priority, the first publication of a name for a taxon.