What does 10-4 mean?

The term "10-4" is part of the ten-codes used in law enforcement and emergency communication. It specifically means "Okay" or "Copy," indicating that a message or instruction has been received and understood. This clear communication is vital in law enforcement situations where quick and accurate responses can be crucial for safety and efficiency.

The use of ten-codes helps to minimize confusion and ensures that messages are communicated succinctly over the radio. In this context, choosing "Okay, copy" accurately reflects the intended meaning of "10-4," which is about acknowledging and confirming receipt of information or orders.