If \( \ell=\lim _{x \rightarrow a} \frac{\sqrt{3 x^{2}+a^{2}}-\sqrt...

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If \( \ell=\lim _{x \rightarrow a} \frac{\sqrt{3 x^{2}+a^{2}}-\sqrt{x^{2}+3 a^{2}}}{(x-a)} \) then -
\( \mathrm{P} \)
(A) \( \ell=1 \forall \mathrm{a} \in \mathbb{R} \)
(B) \( \ell=1 \forall \mathrm{a}0 \)
(C) \( \ell=-1 \forall \mathrm{a}0 \)
(D) \( \ell= \) D.N.E. if \( \mathrm{a}=0 \)
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