Which phrase means 'I have received all of your last transmission'?

• A. Roger
• B. Roger Number
• C. Wilco
• D. Mayday

Answer: (A)

In radiotelephony, you acknowledge that you heard and understood a message with a concise, neutral reply. The phrase that means you have received all of the last transmission is the one used to confirm receipt and understanding. It doesn’t promise to take action; it simply says you heard everything. That’s different from saying you will do something, which would be a “will comply” response, or from a distress call. A common nonstandard variant that isn’t used to indicate receipt of the last message isn’t appropriate here. So the phrase that fits the meaning of “I have received all of your last transmission” is the one that confirms receipt and understanding only.