Final answer:
The principle developments of the Trident system include a nuclear-powered fleet ballistic missile submarine, a strategic weapons system, and an integrated logistics support system. These elements collectively form part of the United States' strategic nuclear deterrent force, ensuring readiness and effective deterrence capabilities throughout the Cold War and beyond. Hence, option (4) is correct.
Step-by-step explanation:
The principle developments of the Trident system include all of the mentioned options: 1. A nuclear-powered fleet ballistic missile submarine, 2. A strategic weapons system, and 3. An integrated logistics support system.
The Trident system is part of the United States' strategic nuclear arsenal designed during the Cold War for mutual deterrence between the US and the Soviet Union. Ballistic missile submarines, such as those in the Trident program, played a key role in the strategy of mutually assured destruction by ensuring a second-strike capability. Indeed, these submarines could hide underwater for extended periods, carrying nuclear missiles that could be deployed with far-reaching and devastating effects.
In addition to the physical hardware of submarines and missiles, the Trident system also encompasses strategic planning, operational support, and logistics required to maintain the readiness and effectiveness of the nuclear deterrent force. Integrated logistics support is essential for maintaining the submarines and their missile systems operational around the clock.