What phrase represents a request to temporarily cease all communication until further notice?

The phrase "standby" is commonly used in communication protocols to indicate that the recipient should pause or hold off on further actions or responses until additional instructions are provided. This term is particularly relevant in emergency or operational contexts, where clarity and immediate understanding are crucial. By using "standby," the communicator effectively conveys the need for a temporary halt in all communication, thereby ensuring that all parties remain alert and prepared for updates.

In contrast, the other choices may imply specific actions or situations rather than a request for a temporary cessation of communication. "Cancel last message" indicates the need to disregard a previously sent message, while "return to station" instructs someone to go back to a designated location. "Receiving well" suggests that a message has been understood and is not compatible with the idea of pausing communication. Thus, "standby" stands out as the correct response to express the request for a temporary communication hold.