A and C make the most sense to me. The other options seem a bit sketchy, like the database is trying to hide something from us. Maybe it's just got stage fright and doesn't want to show us all its wait events!
Hmm, this is a tricky one. I'll go with A and C, they sound the most accurate to me. Although, if I was the Oracle database, I'd probably be waiting for the exam to be over too!
I'm not sure about B, since it talks about 'last waited' events, not current waiting events. And D and E seem a bit off, mentioning terminated sessions instead of active ones.
A and C seem to be the correct answers here. V$SERVICE_EVENT would show wait counts for each service, and V$SESSION_WAIT and V$SESSION have the current wait event details for waiting sessions.
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