Which one of the following can be a set of velocity components of a two-dimensional flow ?

- 1
  
  $u = x + y a n d v = x^{2} + y^{2}$
- 2
  
  u= x+y and v= x-y
- 3
  
  u= xy and v= x/y
- 4
  
  $u = x^{2} + y^{2} a n d v = x^{2} - y^{2}$

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