Determine $\lim _{x \rightarrow 0} \frac{\cos x-1}{x^{2}}$ If the Limit Exists $-\frac{1}{2}$

Multiple Choice

Determine $\lim _{x \rightarrow 0} \frac{\cos x-1}{x^{2}}$
if the limit exists.

A) -1
B) $-\frac{1}{2}$
C) $\frac{1}{2}$
D) 1
E) The limit does not exist.