If $f(x)=3x^2+5x-6$ and $g(x)=x^2-4$ and $h(x)=f(x).g(x),$ then the degree of $h(x)$ is

Question

$\begin{array}{1 1} (a)\;4 \\ (b)\;3 \\ (c)\;2 \\ (d)\; \text{none of the above} \end{array}$