Which schema file is required by OpenLDAP?

inetorgperson.schema defines object classes for representing people but is not strictly required for OpenLDAP's base operation; it is an extension.

The `core.schema` file is fundamental and required by OpenLDAP as it defines the base object classes and attributes (like `top`, `organizationalUnit`, `person`) that are universally used across almost all LDAP directories. Without `core.schema`, OpenLDAP cannot properly define even the most basic directory entries.

openldap.schema defines OpenLDAP-specific object classes and attributes, but it is not the foundational schema required for basic directory functionality.

cosine.schema provides common object classes and attributes but, like `inetorgperson.schema`, it is an optional extension, not a core requirement.

misc.schema typically contains less common or miscellaneous object classes and attributes and is not a fundamental requirement for OpenLDAP's basic functionality.