$\displaystyle{\lim_{x \to 2} ( \frac{\sqrt{1-\cos \{ 2 (x-2) \} }}{x-2} } )$

Question

( A ) does not exist
( B ) $equal \sqrt{2}$
( C ) equals $\frac{1}{\sqrt{2}}$
( D ) $equal -\sqrt{2}$