What command is used to clear a call?

The command used to clear a call is represented accurately by the first option, which typically follows a standardized format in many law enforcement communication systems. This command usually includes a specific unit number, relevant code, and disposition indicating that the incident or call has been resolved or cleared.

Using "UU" in the command signifies "Unit Update," which is a clear indication that the unit is updating their status or responding to a previous call. The inclusion of a 10-code often serves as a concise way of conveying information specific to the type of call and the situation at hand, aiding in efficient communication among personnel.

The wording "Dispo" refers to disposition, which is crucial as it denotes the outcome or resolution of the call, whether it was handled, canceled, or any other status update. This clarity is fundamental in law enforcement operations to ensure all parties are updated on the current status of incidents and resource availability.

The other options represent different commands that do not specifically pertain to clearing a call. Thus, the format and components of the first choice are specifically designed to address the command for clearing a call effectively.