An object literal has an enumerable Symbol-keyed property. Which statement is correct?

An object literal has an enumerable Symbol-keyed property. Which statement is correct?

1. Object spread copies it, Object.keys omits it, and default JSON serialization omits it.
2. Object.keys includes it because its descriptor is enumerable.
3. Object spread omits every Symbol key regardless of its descriptor.
4. JSON.stringify emits the Symbol description as the member name.