After which term and in what manner is the name of the author who described the species mentioned in biological nomenclature?

Which of the following $statement(s)$ is/are not correct?
$(i)$ Genus comprises a group of related species which has more characters in common in comparison to species of other genera.
$(ii)$ Three different genera such as Solanum,Datura and Petunia are placed in the family Malvaceae.
$(iii)$ In case of plants,classes with a few similar characters are assigned to a higher category called Division.

Fishes represent which of the following taxonomic categories?

Species are considered as

$Solanum$ and $Homo$ are respectively....

Which is an odd rule related to biological nomenclature?