The diameter of a solid hemisphere is $7 \, cm$. Find its curved surface area and total surface area (in $cm^2$).
- A$77 \, cm^2, 115.5 \, cm^2$
- B$154 \, cm^2, 231 \, cm^2$
- C$38.5 \, cm^2, 77 \, cm^2$
- D$77 \, cm^2, 154 \, cm^2$
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