Final answer:
The security officer's report of a fire should include the cause, location, time, and number of casualties.
Step-by-step explanation:
The security officer's report of a fire should include the cause of the fire, the location of the fire, the time of the fire, and the number of casualties. Therefore, it is necessary for the security officer to state all of these details in their report. Providing this information helps authorities understand the incident better and can aid in the investigation and prevention of future fires.