If $$\left[a + (\frac{1}{a})\right]^2 - 2\left[a - (\frac{1}{a})\right] = 12$$, then which of the following is a value of '$$a$$'?

A

$$-8 + \surd3$$

B

$$-8 - \surd3$$

C

$$-8 + \surd5$$

D

None of these