For @Rule var score: Int, which synthesized-name description is accurate?

For @Rule var score: Int, which synthesized-name description is accurate?

1. score exposes wrappedValue, _score stores the wrapper privately, and $score exists only when Rule defines projectedValue.
2. score stores Rule, _score stores Int, and $score is always a Binding<Int>.
3. _score and $score are both public aliases for the wrapper instance.