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In Oracle Database 12c, the following are true about privileges and roles: * Option B: PUBLIC acts as a default role granted to every user in a database. * The PUBLIC role is a special role that is automatically granted to all users. It can be used to provide privileges to every user. * Option C: A user has all object privileges for every object in their schema by default. * By default, a user has all privileges on the objects they own, i.e., the objects in their schema. * Option D: A role can contain a combination of several privileges and roles. * Roles are designed to group together privileges and other roles, making it easier to manage and assign security settings to users. Options A, E, F, and G are incorrect because: * Option A: System privileges can be set for specific schemas or objects, not always for the entire database. * Option E: Roles are not "owned" by users in the traditional sense of ownership; they are managed by the database and can be granted to any user. * Option F: Not all roles are owned by the SYS schema; roles are a database security concept and do not have an "owner". * Option G: The PUBLIC role is not something that can be revoked from a user; it is a default role that exists for all users.