Final answer:
The policy of deterrence is most notably exemplified by the Cold War strategy, where the U.S. and Soviet Union built up large nuclear arsenals to prevent mutual destruction.
Step-by-step explanation:
The most noteworthy example of the policy of deterrence was the Cold War strategy. During this period, the United States and the Soviet Union engaged in an arms race, developing extensive nuclear arsenals to prevent the other from initiating a nuclear attack due to the fear of mutual assured destruction.
This policy of deterrence played a significant part in shaping international relations during much of the 20th century.