The Incident Command System $($ICS$)$ is:

A$.$ A military system used in domestic incidents to ensure command and control of Federal resources.

B$.$ Most applicable to the management of complex incidents that extend over many hours or days.

C$.$ A standardized approach to incident management that is applicable for use in all hazards.

D$.$ A relatively new approach created based on the lessons learned from the $\frac{9}{11}$ terrorist attacks.