A. All civilian small UAs weighing greater than .55 pounds must be registered regardless of its intended use.
Unmanned aircraft weighing less than 55 pounds and more than 0.55 pounds (250 grams) on takeoff, including everything that is on board or otherwise attached to the aircraft and operated outdoors in the national airspace system must register.
This is correct.
Drones weighing 55 pounds or more are registered under Part 47
14 CFR§48.15 Requirement to register.
No person may operate a small unmanned aircraft that is eligible for registration under 49 U.S.C. 44101-44103 unless one of the following criteria has been satisfied:
(a) The owner has registered and marked the aircraft in accordance with this part;
(b) The aircraft weighs 0.55 pounds or less on takeoff, including everything that is on board or otherwise attached to the aircraft;
30 According to 14 CFR part 48, when must a person register a small UA with the Federal Aviation Administration?