Answer:

The correct IUPAC symbol for the element Cobalt is option 'A' which is Co.

Cobalt is a chemical element with the atomic number 27 and the symbol Co. It belongs to the transition metals group in the periodic table. The IUPAC (International Union of Pure and Applied Chemistry) is responsible for assigning symbols and names to chemical elements.

Explanation:

1. IUPAC Nomenclature:
The IUPAC nomenclature system is used to assign symbols and names to chemical elements. It ensures consistency and uniformity in the naming of elements across different languages and countries.

2. Cobalt:
Cobalt is a metallic element that is commonly used in various industries, including metallurgy, electronics, and medicine. It is a hard, lustrous, silver-gray metal with magnetic properties. Cobalt is found in the Earth's crust and is primarily obtained as a byproduct of nickel and copper mining.

3. IUPAC Symbol:
The IUPAC symbol for an element is a one- or two-letter abbreviation that represents the element. It is derived from the name of the element in English or Latin. The symbol should be unique and distinct from the symbols of other elements.

4. Correct IUPAC Symbol for Cobalt:
The correct IUPAC symbol for the element Cobalt is Co. It is derived from the first two letters of the element's name. The symbol Co is universally accepted and recognized by scientists and researchers worldwide.

Conclusion:
In conclusion, the correct IUPAC symbol for the element Cobalt is Co. It is important to use the correct symbol when referring to elements in scientific literature and discussions to ensure clarity and accuracy.