The total surface of a cone, whose radius is $\dfrac{r}{2}$ and slant height $2l$ is

Question

$\begin{array}{1 1} (a)\; 2 \pi r(r+l) \\ (b)\; \pi r(l+r) \\ (c)\; 2 \pi r l \\(d)\; \pi r(l+\frac{r}{4}) \end{array}$