Explanation: The First Class Radiotelegraph Operator License, like other FCC commercial operator licenses (such as the General Radiotelephone Operator Permit), is valid for a term of five years. According to FCC regulations, these licenses can be renewed indefinitely without the need for retesting, provided the renewal application is filed in a timely manner. This ensures that operators who maintain their competency and adherence to regulations can continue to hold their credentials without repeated examinations. Options A and B are incorrect as commercial licenses are not valid for a lifetime or ten years; the latter is the term for amateur radio licenses. Option C is incorrect because renewal of this commercial license does not require retaking exam elements.