Explanation: Logkeeping in radio operations, particularly in maritime settings (which often overlap with general radio knowledge on amateur exams), is crucial for regulatory compliance and operational safety. * **A) Entries relating to pre-voyage, pre-departure and daily tests are required.** This statement is true. Under GMDSS (Global Maritime Distress and Safety System) regulations, regular testing of radio equipment, including daily tests of DSC equipment and batteries, pre-voyage checks, and pre-departure inspections, must be performed and recorded in the station's log. This ensures the equipment is operational and ready for use. * **C) A summary of all required Distress communications heard and Urgency communications affecting the station’s own ship. Also, all Safety communications (other than VHF) affecting the station’s own ship must be logged.** This statement is also true. It is a fundamental requirement for a radio log to record all distress and urgency communications, whether originating from the station or merely heard and relevant. Similarly, significant safety communications, especially those impacting the vessel's navigation or safety, must be logged to provide a comprehensive record of events and actions taken. * **D) Routine daily MF-HF and Inmarsat-C transmissions do not have to be logged.** This statement is incorrect. While not every single routine transmission might require a detailed entry, significant routine communications (like position reports, regular safety calls, or company communications) are often logged to maintain a complete operational record and demonstrate compliance. Since both statements A and C accurately describe essential logkeeping requirements, **B) Both a) and c)** is the correct answer.