Which three are true about privileges and roles?

Which three are true about privileges and roles?
A. A role is owned by the user who created it.
B. A role can contain a combination of several privileges and roles.
C. System privileges always set privileges for an entire database.
D. A user has all object privileges for every object in their schema by default.
E. All roles are owned by the SYS schema.
F. PUBLIC can be revoked from a user.
G. PUBLIC acts as a default role granted to every user in a database.

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