If $f: R \rightarrow R$ and $g: R \rightarrow R$ are defined by $f(x)=2x+3$ and $g(x)=x^2+7$,then the values of $x$ such that $g(f(x))=8$ are

  • A
    $1, 2$
  • B
    $-1, 2$
  • C
    $-1, -2$
  • D
    $1, -2$

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