The Curved Surface Area $(CSA)$ of a frustum of a cone is given by:
- A$\pi l(r_{1} + r_{2})$
- B$\pi l(r_{1}^{2} + r_{2}^{2})$
- C$\pi(r_{1} + r_{2})$
- D$\pi l(r_{1}^{2} - r_{2}^{2})$
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