19980
Initially sensors were optical and acoustic devices developed during World War I and continued into the 1930 s , but were quickly superseded by radar , which in turn was supplemented by optronics in the 1980 s .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None