WITH GRANT OPTION can be used when granting an object privilege to both users and roles, making option B true. Revoking an object privilege granted with WITH GRANT OPTION does have a cascading effect, so option C is also true. Adding a foreign key constraint that points to a table in another schema requires the REFERENCES object privilege, which makes option D correct. Option A is incorrect because WITH GRANT OPTION can be specified when granting object privileges to users and roles, but not to PUBLIC. Option E is incorrect because revoking a system privilege granted with WITH ADMIN OPTION does not have a cascading effect.