Final answer:
Option (d), When an Incident Commander determines a section within the Incident Command System as unnecessary, the functions of that section are not performed by anyone, as they are deemed unnecessary for the incident's management.
Step-by-step explanation:
If the Incident Commander (IC) determines that a particular section is not necessary, the functions of that section are carried out by no one - there are no functions to perform. In the Incident Command System (ICS), each section within the system has a specific role and set of responsibilities.
If the IC decides a section is not needed for a given incident, it implies that the functions associated with that section are also not required for the incident's management. Therefore, these functions are not delegated to anyone else, as they are deemed unnecessary in the context of the particular incident.