Question: You want to know each time a class property is updated. If the new value is not within range, you want to stop the update. Which code snippet shows a built-in delegated property that can accomplish this?

1. `Delegates.vetoable()`
2. `Delegates.cancellable()`
3. `Delegates.observer()`
4. `Delegates.watcher()`

Answer: The correct answer of the above question is Option A:`Delegates.vetoable()`