What does the term 'Copy' signify in radio communication?

In radio communication, the term 'Copy' signifies that the receiver acknowledges that they have received the message. It indicates clarity and understanding of the communication transmitted. When a person responds with 'Copy,' it assures the sender that the intended information has been correctly understood and noted. This term is essential for confirming that important instructions or messages have reached the intended party, ensuring effective communication during operations, especially in environments where clarity is crucial for safety and coordination.

The other options represent different aspects of communication but do not capture the essence of what 'Copy' means. For instance, 'Begin transmission' would imply an initiation of communication rather than acknowledgment of receipt. 'Message not understood' addresses a lack of clarity, which contradicts the purpose of 'Copy.' Finally, 'End of communication' suggests the conclusion of a conversation rather than the affirmation of receipt of a specific message. Each of these terms plays a role in radio communication but carries a distinct meaning separate from the acknowledgment that 'Copy' provides.