Explanation: Proper radiotelegraph (CW) equipment testing involves transmitting a series of "VVV" (three Vs) followed by the transmitting station's call sign. "VVV" is the international Morse code signal for a test transmission, warning other operators that the following signals are for equipment adjustment or testing. Including the call sign immediately afterward identifies the station conducting the test, which is a fundamental FCC requirement for station identification (e.g., Part 97.119 for amateur radio). Sending at a slow speed, such as 10 words-per-minute, ensures easy recognition of the test signal by other stations. A) "EI" is a prosign often used in CW to indicate the end of a transmission or contact, not a test signal. Using it for a test would be incorrect and confusing. C) While listening before transmitting is crucial, requiring explicit consent from *all* stations on frequency for a brief test is not an FCC regulation or practical procedure. The "VVV" is a warning, not a request for permission. D) Notifying a public or private coast station is irrelevant for amateur radio operations. Coast stations are part of the maritime radio service.