SELF TEST ANSWERS
Understanding Users and Groups
1. 
D. A username cannot exceed eight characters.
A, B, and C are incorrect. These are all legal usernames. As long as a username has a letter character along with at least one character of the opposite case, or a number, the useradd utility will accept it. It will complain if you start the username with a number, but it will still accept the entry. Take some time to experiment with other poor naming choices to see how the utility responds.
2. C. The UID and GID are separate numeric identifiers. ...
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