I haven't seen this in errata, and apologies if it's a duplicate post or my misunderstanding.
One of the questions on mock exam 3 has a couple of errors.
The question about public enum Suit and Color (enum within enum question)...
1. Option D states that "Color.Black should be replaced by BLACK on line 2". It should be Color.BLACK in the option.
2. Option E states that "Color enum on line 4 should be declared private". It is already private in the provided example code.
I think that Option E typo could, potentially, affect the answer choice. Either the access modifier in the code or in the option should be changed, to make option E a viable option.