For what values of $k$ does the equation $kx^2+6x+1=0$ has real roots.

Question

$\begin{array}{1 1}(A) \; k < -4\text{ or }k > 4\\(B)\;k \leq -4\text{ or }k \geq 4 \\(C)\;k > -4\text{ or }k < 4 \\(D)\;k \geq -4\text{ or }k \leq 4\end{array}$