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Primitive of $\frac{{3{x^{4\,}} - 1}}{{{{({x^4} + x + 1)}^2}}}$ w.r.t.  $x$ is :

• A
  $\frac{x}{{{x^4}\,\, + \,\,x\,\, + \,\,1}}$ $+ c$
• ✓
  $-$ $\frac{x}{{{x^4}\,\, + \,\,x\,\, + \,\,1}}$  $+$ $ c$ 
• C
  $\frac{{x\,\, + \,\,1}}{{{x^4}\,\, + \,\,x\,\, + \,\,1}}$ $+ $ $c$
• D
  $-$ $\frac{{x\,\, + \,\,1}}{{{x^4}\,\, + \,\,x\,\, + \,\,1}}$ $+$ $ c$