    Sentence t By what main’ attribute. “are  cornputational probleriis .. classified.” utiizing  computational complexity theory?    |Santance’ 2: Computational complexity theory, is  Ja branch: of the theorg Gf computation. in  theoreti¢al. computer science that focuses’ on  classifying cornputational problems accérding to  {Hair inherent difficulty, and relating these classes  to each other,    