If function \( f(x) \) is differentiable at \( x=a \), then \( \lim...

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If function \( f(x) \) is differentiable at \( x=a \), then \( \lim _{x \rightarrow a} \frac{x^{2} f(a)-a^{2} f(x)}{x-a} \) is :
\( \mathrm{P} \)
(1) \( -a^{2} f^{\prime}(a) \)
(2) \( a f(a)-a^{2} f^{\prime}(a) \)
(3) \( 2 a f(a)-a^{2} f^{\prime}(a) \)
(4) \( 2 a f(a)+a 2 f^{\prime}(a) \)
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