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This file has two key components : rel_ops GCC ′ s implementation declares the namespace ( nested within ) in the following manner : namespace rel_ops Consider the following declaration of , which defines equality and less-than operators for comparison against other objects of the same type : class A ; void f1 ( const A & a1 , const A & a2 ) By invoking the templates , one can assign a default meaning to the remaining relational operators .
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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:
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