ICBN stands for
(a) International Classification of Biological Nomenclature
(b) International Class of Biological Nomenclature
(c) International Code of Botanical nomenclature
(d) International Classification of biological naming

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Hint An organism is known by its two names one is a vernacular name while the other is a scientific name. Vernacular name is used locally and it changes from place to place while the scientific name is used universally and it does not change from place to place.

Complete Answer:
The scientific names of any species are given by ICBN and ICZN. They also framed the universal rule for using the scientific name. ICBN stands for International Code of Botanical Nomenclature whereas ICZN stands for International Code of Zoological Nomenclature.

Additional information:
Guidelines for the naming of organisms are:
The scientific name is consisting of only two words generic and specific. First is a generic and specific word.
Generic name begins with a capital letter and the specific name begins with a small letter
The scientific name should be written in italics or underlined form.
The scientific name is taken from Latin or Greek languages because they are dead languages and the meaning of the word does not change.
No two generic names in any kingdom can be the same but specific names can be repeated.
The nomenclature of a taxonomic group determined by publication priority and all other names are synonyms.
The selected name does not resemble the previously published name. For publishing a new name or type of specimen, the organism should be kept in a herbarium or museum for reference.
The scientific name should be descriptive and indicate the important characteristic of the organism.

So, the correct answer is the ‘International Code of Botanical Nomenclature’.

Note: The specification is of six types Holotype, Isotype, Paratype, Syntype, lectotype, and Neotype. In holotype specimen is nomenclature type, in isotype duplicate of holotype created, in paratype different specimen cited with original description, in syntype two or more specimen cited when there is no holotype, in lectotype specimen selected from original material which is in no holotype and neotype is new nomenclature type when the original material is missing.