Your question is SQL Indexes, DAX, and Direct Query. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Explain the differences between indexes storage on disk, how INTERSECT works, how to use ROW_NUMBER without ORDER BY, sum vs SUMX in DAX, and how to optimize Power BI DirectQuery.