What is the vector in operator overloading?

(a) class

(b) method()

(c) data type

(d) none of the mentioned

I have been asked this question in an interview for job.

I would like to ask this question from Introduction of Overloaded Operators in portion Object Oriented Concepts of C#

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  y+=x;
  }
  main()
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  }
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  (A) 5 and 16
  (B) 5 and 12
  (C) 5 and 20
  (D) 12 and 20
  
  

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  (C) key and ordering
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  (C) 12
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