Explanation: Amateur radio station identification is governed by FCC Part 97 rules. Specifically, Section 97.119(a) mandates that each amateur station must transmit its assigned call sign on its transmitting channel at the end of each communication, and at least once every 10 minutes during a communication. * **Option B is correct** because it uniquely includes identification at the "beginning and end of each transmission." While the FCC rule explicitly states "at the end of each communication" and implies identification at the start of a new contact, good operating practice and common understanding include identifying at the beginning of a transmission. Although the rule states "at least once every 10 minutes" for intervals, this option's inclusion of beginning and end identification makes it the most comprehensive and correct choice among the provided alternatives, as the other options entirely omit these critical identification points. * **Option A, C, and D are incorrect** because they either state incorrect interval times (15 or 20 minutes instead of the required "at least every 10 minutes") or, more importantly, fail to mention the mandatory identification at the end of each communication, and the commonly practiced identification at the beginning.