If $f(x)$ and $g(x)$ are two real-valued functions such that $f(g(x+y)) = f(g(x)) + f(g(y))$,$g(1) = 2$,and $f(2) = 1$,then the function $g(f(x))$ is discontinuous on the set

  • A
    $R$
  • B
    $(0, \infty)$
  • C
    $(-\infty, 0)$
  • D
    $\phi$

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