Answer: All of the answers are correct EXCEPT "An instance of a class cannot be changed after it is created.
Explanation: I've done the problem. Also, if you have an instance of a class, you can no longer change it. It is frozen in time as that one instance. If had a class defining pets and you made an instance dogA where the pet was a brown medium sized dog, dogA would always be a brown medium sized dog. I think, at least.