For what values of $k$ will the equation $4x^2-3kx+1=0$ has real roots?

Question

$\begin{array}{1 1}(A) \; k \leq \large\frac{-4}{3}\normalsize \text{ or }k \geq \large\frac{4}{3}\\(B)\;k < \large\frac{-4}{3}\normalsize \text{ or }k > \large\frac{4}{3} \\(C)\;k \geq \large\frac{-4}{3}\normalsize \text{ or }k \leq \large\frac{4}{3}\\(D)\;k > \large\frac{-4}{3}\normalsize \text{ or }k < \large\frac{4}{3}\end{array}$