If $$L = \mathop {\lim }\limits_{x \to 0} {{a - \sqrt {{a^2} - {x^2}} - {{{x^2}} \over 4}} \over {{x^4}}},a > 0$$. If L is finite, then
- A$$a = 2$$
- B$$a = 1$$
- C$$a = {1 \over 3}$$
- DNone of these
✓ Correct answer: A
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