How many total cooling units are installed in AUX1?

The correct choice reflects the total number of cooling units installed in AUX1, which is typically designed to support various systems on the ship that require temperature regulation. Each cooling unit plays a crucial role in maintaining operational efficiency and comfort in the auxiliary spaces. Having two units ensures redundancy; if one unit fails, the other can still function, preventing overheating and maintaining necessary conditions for equipment and personnel. This redundancy is vital in a naval environment where consistent operational capabilities are essential.

In contrast, other options suggest either an insufficient number of units, which could compromise cooling during peak loads, or an excessive amount, which might indicate over-engineering or unnecessary complexity in the auxiliary space. Hence, two units offer a balanced approach to cooling requirements while ensuring reliability.