Which code accurately represents a unit that has been dispatched?

The code that accurately represents a unit that has been dispatched is S4300. This alphanumeric code typically signifies a specific unit type or designation within dispatching protocols. Dispatch codes are often standardized to ensure that communication is clear and uniform across various incidents or situations.

In this context, when a particular unit is dispatched, it is essential to use a code that effectively identifies the unit and its status within the system. The S4300 code likely corresponds to a specific service type or operational area, making it a clear indicator that the unit is in an active response mode.

Other choices, while potentially relevant in different contexts, do not specifically indicate a dispatched status. For instance, "ER" could suggest a type of emergency response but does not confirm dispatch. "No traffic" implies that there is no active incident requiring attention, and "TL" might indicate a type of unit or location but does not confirm that the unit has been dispatched. Hence, S4300 is the most appropriate choice to denote a dispatched unit.