What is the proper course of action when law enforcement arrives at a call?

The correct answer is establishing that the officers must first be "On Scene" when they respond to a call. Being on scene is the initial step in law enforcement's response to an incident. This means that officers have physically arrived at the location where the incident was reported. It is crucial for them to assess the situation in order to determine the appropriate course of action based on what they observe and how the circumstances may evolve.

Once on scene, law enforcement can evaluate the safety of the area, determine if there are any immediate threats, and start implementing any necessary safety protocols. Additionally, the officers can observe and collect any preliminary information that may be vital for further action. Being present on scene enables them to effectively communicate with dispatch, call for additional resources if required, and begin to coordinate their response to ensure the situation is handled appropriately.

The other options represent actions that are typically undertaken after the officers have arrived on the scene. Securing the area is essential for establishing a perimeter to protect evidence and ensure safety; establishing command is crucial for coordinating efforts among various responding units; and conducting interviews is part of the investigative process that occurs once the situation is stabilized. However, none of these actions can occur until the officers are physically on scene to assess the situation.