Determine the value of K so that the function. $ f(x) = \left\{ \begin{array}{l l} Kx^2 & \quad if \quad x \leq 2 \\ 3 & \quad if \quad x > 2 \end{array} \right. $ is continuous .

Question

$\begin{array}{1 1}(A)\;2 \\(B)\;\frac{1}{4} \\(C)\;2 \\(D)\;\frac{3}{4} \end{array}$