Nomenclature is to assign a universal scientific name to taxon based on the international rules agreed upon by ICBN/ICZN/ ICVN/ICNCP to maintain uniformity in the system. Classification is arrangement of organisms into groups on the basis of their similarities. Identification is reorganization of an unknown taxon by comparing it with already known taxa and assigning it correct rank and position in taxonomic hierarchy. Description of a plant includes listing of its taxonomic characters that represent its similarities and dissimilarities with other closely related taxa. Systematics is the branch of science that deals with study of diversity of organisms and their comparative and phylogenetic relationships. It aims at identification, nomenclature, description and classification of a taxon to provide an inventory of local, regional and continental plant resources. This makes all provided options correct.