Answer:
Option D is the correct answer.
Step-by-step explanation:
According to WordReference English Dictionary, the term commander is defined as a person in authority, a chief officer, a leader or as an officer in the U.S. Navy or Coast Guard ranking below a captain and above a lieutenant commander. In this case, the true statement says that Upon arriving at an incident the higher ranking person will either assume command, maintain command as is, or reassign command to a third party, which is the right answer.