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Which of the following is incorrect about keys?

A)  Key is a taxonomical aid used for identification of plants and animals based on the similarities and dissimilarities.

B)  Separate taxonomic keys are required for each taxonomic category such as family, genus and species for identification purposes.

C)  Keys are generally analytical in nature.

D)  Key is an another taxonomical aid used for nomenclature of plants and animals based on the similarities and dissimilarities.