Answer:
Option 1
Step-by-step explanation:
If a country has for example, a hydrogen bomb, an enemy country would not like to attack said country as they will have the fear of being bombed, this bomb acts as a "deterrent". A real world example of this is the Cold war, where both the USSR and USA were at war, but due to the threat of the Nuclear bombs each side possessed, the war was "cold" as in no gunfire.