Find the total surface area of new solid, if two solid cylinders of same base radii \( \mathrm{r...

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Find the total surface area of new solid, if two solid cylinders of same base radii \( \mathrm{r} \) and height \( \mathrm{h} \) are joined together along their bases.
a. \( 2 \pi \mathrm{r}(2 \mathrm{~h}+\mathrm{r}) \)
b. \( 4 \pi \mathrm{rh} \)
c. \( 2 \pi r^{2} \)
d. \( 2 \pi \mathrm{r}(\mathrm{r}+\mathrm{h}) \)
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