Anyone take CAIA?

here is a question about waterfall (level1),anyone help? I temporally set up a forum for CAIA exam discussion. Someone asked a question there, but I dont know either. Anyone help? Thank you!

The question is poorly worded. I remember doing these on the exam, they arent that difficult. Also well covered in the course books.

Jiao, I don’t know much about the CAIA exams. I only know that it has two exams. How many hours are needed to study for each level exam? How are they difficult compared with CFA exams? And what are the historical passing rates? Thanks.