Answer:
d. nuclear
Step-by-step explanation:
the correlates of war data categorize in to four categories depends
interstate war = this war happens between well known and recognized states
intrastate war= this war happens within the territory of the recognized state
Non-State Wars: Between or among non-state entities.
extra state war= it is the war of the group or member of the state with the group of other state which is not considered to be part of inter state system