Which of the following comments would be the best post-condition for this swap function void swap( int& left, int&right);
a. //Postcondition: None
b. //Postcondition: the values of left and right are exchanged.
c. //Postcondition: left has the value of right
d. //Postcondition: left and right are unchanged
b. //Postcondition: the values of left and right are exchanged.
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