Let 'a' be a non-zero real number. If the equation whose roots are the squares of the roots of the cubic equation $x^3-a x^2+a x-1=0$ is identical with this cubic equation, then ' $a$ ' =

• A

  $\frac{1}{3}$
• Correct answer
  B

  3
• C

  $\frac{1}{2}$
• D

  2

Hence, the correct answer is option: 'B'.