What does the code 4 indicate?

In the context of Arizona Department of Public Safety codes, the code 4 signifies that no further assistance is needed at the scene. This means that the situation has been assessed, and the responding officers have determined that the situation is under control, and additional support is not required. This code helps to communicate to other units that they can stand down and that resources can be directed elsewhere if needed.

The other choices do not accurately represent what code 4 means. For instance, a request for backup indicates a need for additional units, which is contrary to the meaning of code 4. Similarly, "last unit on scene" and "emergency situation under control" are indications that may describe the status of the situation or the presence of units but do not convey that no further assistance is required, as code 4 does.