Final answer:
When executing 'cd ..' at the root level on UNIX-like operating systems, the command does not result in an error message, nor does it change to the home directory; it simply keeps you in the root directory.
Step-by-step explanation:
Executing the command 'cd ..' when at the root level of a UNIX-like operating system will typically not change the working directory since you are already at the highest-level directory in the filesystem hierarchy. Generally, this command is used to move up one directory level, but since the root is the very top, it can't go up any further. Instead, the command will keep you at the root level, and no error message will be displayed because this is expected behavior. It is not unix-flavor dependent, and it does not result in changing to the 'home' directory. Therefore, the correct answer is:
1) Error message indicating the user can't access beyond the root level - This is incorrect because there is no error message; the system simply remains in the root directory.
2) Behavior is unix-flavor dependent - This is incorrect as well; the behavior of 'cd ..' at the root level is consistent across unix-like operating systems.
3) Results in changing to the 'home' directory - This is also incorrect. The 'cd' command without arguments or 'cd ~' would take you to the home directory, not 'cd ..'