Final answer:
The true statement regarding incident commanders is that they hold full legal authority for decision making. They are responsible for managing all aspects of an incident and their decisions can be made independently from other coordinators, though teamwork is critical. They are still liable for their decisions made during an MCI.
Step-by-step explanation:
Incident commanders within the Incident Command System (ICS) hold full legal authority for decision making during an incident, including a Mass Casualty Incident (MCI). They are responsible for establishing strategies, assigning resources, and making decisions to effectively manage the incident. Incident commanders may consult with various personnel including medical directors, but they do not make decisions in conjunction with the medical director as a rule. Unlike option B, which correctly states that they hold full legal authority, option C is incorrect as they do not need to clear all decisions with logistics coordinators, although coordination is crucial for the success of operations. Lastly, option D is incorrect because incident commanders, although they hold significant authority, are not free from liability for the decisions they make during an MCI.