https://blog.gongquiz.com/2024/04/02/%eb%8b%88%ec%bc%88-%ec%b9%b4%eb%93%9c%eb%ae%b4ni-cd-%ec%b6%95%ec%a0%84%ec%a7%80%ec%97%90-%eb%8c%80%ed%95%9c-%ec%84%a4%eb%aa%85%ec%9c%bc%eb%a1%9c-%ed%8b%80%eb%a6%b0-%ea%b2%83%ec%9d%80-%ec%a0%84/