Which statement is correct in Swift 6 language mode?

Which statement is correct in Swift 6 language mode?

1. A wrapped property may have willSet or didSet, but cannot define its own get or set, and a global-actor wrappedValue does not isolate the whole enclosing type by outward inference.
2. A wrapped property cannot have observers, and @MainActor on wrappedValue always isolates the enclosing type.
3. A wrapped property may replace the synthesized getter, but only inside a structure.