Answered

Which Incident Command System element provides a command structure to enable agencies with different legal, jurisdictional, and functional responsibilities to coordinate, plan, and interact effectively on scene while maintaining their own authority, responsibility, and accountability?

AArea Command
BUnified Command
CUnity of Effort
DUnity of Command

Verified Answer :

Generally speaking, it would be a "b. Unified Command" that does this, since all the different branches of authority are "unified" under this system. Another terms is often "Joint Command".