Haha, I bet option B is a trap question. System privileges are usually more granular than that. And who would ever want to revoke PUBLIC from a user? What are they, some kind of database supervillain?
I'm not sure about option C. I thought roles could be owned by any user, not just SYS. And option E seems a bit too broad - users don't get all object privileges by default, right?
I think options D and G are the correct answers here. A role can definitely contain a combination of privileges and other roles, and PUBLIC is a default role granted to all users in a database.
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