What is the identity of I in the following diagram of the citric acid cycle? 
Definitions:
Operating Departments
Divisions or units within an organization that are directly involved in the core operations or primary purpose of the business.
Setup Cost
The expenses incurred to get equipment ready to process a different batch of goods, distinct from the operational costs of running the equipment.
Number of Setups
A measurement in manufacturing that refers to how many times equipment is adjusted or changed to produce different products.
Maintenance Department
The section of an organization responsible for maintaining and repairing its facilities, equipment, and vehicles to ensure operational efficiency.
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