Which of the following statements is CORRECT?

The relationship is inverted - the CMDB is a data store that sits inside the CMS, and the CMS itself is a component of the SKMS, not the other way around.

In ITIL, the Service Knowledge Management System (SKMS) is the overarching system encompassing all knowledge and information management tools and repositories used across the service lifecycle. The Configuration Management System (CMS) - which itself contains one or more CMDBs - and the Known Error Database (KEDB) are both distinct sub-components that reside within the larger SKMS structure.

The SKMS is the larger containing system; the CMS is a subset of the SKMS, so stating the SKMS is part of the CMS reverses the correct hierarchical relationship.

The CMS and KEDB are separate, peer-level components both contained within the SKMS; the CMS manages configuration data while the KEDB stores known errors, and neither contains the other.