9.
A store should be an ___________ object tree in Redux.
Directory
Dynamic
Mutable
Immutable
Correct: D
In Redux, a store should be an immutable object tree. This means that the state within the store cannot be directly modified. Instead, actions are dispatched to the store, which triggers the corresponding reducers to create a new state object with the desired changes. This immutability ensures a predictable and controlled state management in Redux.