If $R$ is the set of all real numbers and $f: R-\{2\} \rightarrow R$ is defined by $f(x)=\frac{2+x}{2-x}$ for $x \in R-\{2\}$,find the range of $f(x)$.
- A$R-\{-2\}$
- B$R$
- C$R-\{1\}$
- D$R-\{-1\}$
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