Command is:
a. Directing, ordering, or controlling by virtue of explicit statutory, regulatory, or delegated authority.
B. The ability to control information exchange within and across organizations involved in an incident.
C. Based on the number of individuals or resources that one supervisor can manage effectively during an incident.
D. Assumed by the individual who is the highest ranking person on the scene regardless of experience or training level.
In general terms, command is "a. Directing, ordering, or controlling by virtue of explicit statutory, regulatory, or delegated authority," since command is relative to the position in question.