Explanation: Ship stations using telegraphy, particularly for two-way communication, require the ability to rapidly switch between transmitting and receiving. This is crucial for efficient communication, allowing operators to send messages and then quickly listen for a reply or for another station to "break in." While not always fully "automatic" in the sense of a hands-off system, the equipment must be designed to facilitate a quick and seamless transition, often through a dedicated switch, key, or relay. This capability is an operating control requirement ensuring effective and responsive communication, as manual, slow switching would severely impede conversational flow. * **B) A ship station control operator must stand watch on emergency channels at all times:** This is a watchkeeping requirement for operator duty, not an operating control requirement for the station's equipment functionality, and "at all times" is not universally accurate for all vessels and GMDSS areas. * **C) Only a licensed First Class Radiotelegraph Operator may operate a ship station:** This is incorrect regarding licensing requirements. Other classes of radiotelegraph operators (Second, Third) are also licensed, and GMDSS operators are now prevalent. It's a licensing requirement, not an equipment control requirement. * **D) The ship station must be capable of changing from one radio channel to another within five seconds:** While quick channel changing is desirable, a specific "five-second" rule is not a general, universally mandated operating control requirement for all telegraphy ship stations.