A developer needs to upgrade an existing custom component based on Core Components Version 1...

Custom components built on Core Components should use the sling:resourceSuperType property to inherit functionality. When upgrading from v1 to v2 Core Components, the developer updates the sling:resourceSuperType property of the custom component to reference the new v2 implementation. This allows the custom component to inherit all new features and bug fixes introduced in v2 while retaining its customizations. Option A is incorrect because sling:resourceType defines the resource type of the component itself, not inheritance. Option B is incorrect because there is no automatic upgrade mechanism in AEM; developers must explicitly update the inheritance path. Adobe documentation clearly states that upgrading Core Components is achieved by re-pointing sling:resourceSuperType to the new version.