Prior authorization from ATC under § 107.41 is required before operating a small UA in which airspace?

Why: 14 CFR 107.41: no person may operate a small UA in Class B, C, or D airspace, or within the lateral boundaries of the surface area of Class E airspace designated for an airport, unless that person has prior authorization from ATC.

• Confuses the 400-foot altitude limit in § 107.51(b) with the airspace-class trigger for ATC authorization in § 107.41 — authorization depends on airspace class, not altitude.
• Reverses the rule; Class G is uncontrolled airspace, where § 107.41 specifically does not require ATC authorization.