Question id 45 - Airspace Classification - FAA Part 107 Drone Quiz

No, you can never fly above 400 feet AGL.
Yes, you can fly up to 900 feet AGL (400 feet above the top of the 500-foot tower) while remaining within a 400-foot radius of the tower.
Yes, but you need ATC authorization because you are above 400 feet.

Training tests and timed exam simulations FAA Part 107 Drone Quiz