Let ${z_1}$ and ${z_2}$ be two roots of the equation ${z^2 + az + b = 0}$,where ${z}$ is a complex number. Further,assume that the origin,${z_1}$,and ${z_2}$ form an equilateral triangle. Then:

  • A
    ${a^2 = b}$
  • B
    ${a^2 = 2b}$
  • C
    ${a^2 = 3b}$
  • D
    ${a^2 = 4b}$

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