What does "line of sight" refer to in a rescue scenario?

In a rescue scenario, "line of sight" refers specifically to the ability to see the victim clearly without any obstructions. This is a critical aspect in swiftwater rescue operations as maintaining a clear view of the victim allows rescuers to assess their condition, make informed decisions, and execute a safe and effective rescue. Visibility can be affected by various factors, including environmental conditions, the victim's position in relation to obstacles, and water movement. Ensuring a clear line of sight not only enhances situational awareness for the rescuers but also is vital for effective communication with the victim, providing instructions, and gauging the dynamics of the rescue environment. Other options relate to distance, equipment usage, and approach angles, but they do not directly address the key aspect of visual clarity in locating and assisting the victim.