Which response corresponds to 10-22?

• A. Call by telephone
• B. Standby
• C. Send backup
• D. Disregard

Answer: (D)

In radio communication, 10-22 means to disregard or cancel the previous instruction. This code is used to tell responders to stop what they were about to do or to ignore the prior transmission, effectively halting the action.

That’s why the correct choice is the option that conveys disregard. The other options describe different actions (calling by phone, standing by, or sending backup), which are not the meaning of 10-22. In practice, codes can vary by agency, but for this item, 10-22 is understood as cancel/disregard.