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Please find below the solution to the asked query 

Option (a) is correct. 

Holotype: A single specimen on which the name of the taxon is based.

Isotype: Any specimen which is a duplicate of holotype

Paratype: Specimens of the type species other than the holotype

Lectotype: A syntype (specimen cited in the prologue when no type is designated or two or more specimens are designated as types.) which is later designated as the name-bearing type specimen.

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