What does schema checking do?

What does schema checking do?

A.
Authenticates users attempting to access resources protected by an NGX Security Gateway.

B.
Verifies that every object class, and its associated attributes, is defined in the directory schema.

C.
Maps LDAP objects to objects in the NGX objects_5_0.C file.

D.
Verifies the Certificate Revocation List for Certificate validity.

E.
Provides topology downloads for SecuRemote and SecureClient users authenticated by an LDAP server.