Let \( \mathrm{f}(\mathrm{x}) \) be a differentiable function at \(...

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Let \( \mathrm{f}(\mathrm{x}) \) be a differentiable function at \( x=a \) with
P \( f^{\prime}(a)=2 \) and \( f(a)=4 \). Then \( \lim _{x \rightarrow a} \frac{x f(a)-a f(x)}{x-a} \)

W equals:
(A) \( 2 a+4 \)
(B) \( 2 a-4 \)
(C) \( 4-2 a \)
(D) \( a+4 \)
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