Which signature accepts an `Integer` source and a `Number` destination while preserving t…

Which signature accepts an `Integer` source and a `Number` destination while preserving type safety?

1. `<T> void copy(List<? super T> destination, List<? extends T> source)`
2. `<T> void copy(List<? extends T> destination, List<? super T> source)`
3. `void copy(List<Number> destination, List<Number> source)`
4. `void copy(List<?> destination, List<?> source)`