what should developer do ?a.b. c. d.

Hi @jakecham,Answer C is correct, as it represents basic structure that you will get generating project using Adobe AEM Project Archetype.See below links to get more information about AEM Project structure, and each module:https://experienceleague.adobe.com/docs/experience-manager-learn/cloud-service/developing/basics/project-structure.html?lang=en https://experienceleague.adobe.com/docs/experience-manager-core-components/using/developing/archetype/using.html?lang=en