How should a security officer respond to a medical emergency?

In a medical emergency, a security officer's response must be prompt and decisive to ensure the safety and well-being of the individual in distress. Calling for help and providing first aid as needed is the appropriate course of action because it addresses both the immediate needs of the victim and the necessity to involve professional medical assistance.

By calling for help, the officer ensures that emergency services are notified and on their way, which is critical in serious situations where timely medical intervention can make a significant difference in outcomes. Providing first aid, if the officer is trained, allows them to stabilize the individual until professional responders arrive. This proactive approach demonstrates the officer's responsibility and commitment to the safety of others.

The other options present suboptimal responses. Waiting for emergency services without taking any action could result in escalated medical emergencies, while leaving it to bystanders may not guarantee that someone is trained or willing to help. Additionally, only providing first aid if trained overlooks the importance of quickly summoning professional assistance while also utilizing any first aid training the officer may possess. Ultimately, option C encapsulates a comprehensive and responsible approach to managing medical emergencies effectively.