This cert question is incorrect

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Question 15: (QID=4136) Which command will change all processes started by members of the backup group to the lowest scheduling priority? 1. renice –19 –u backup 2. nice –n-20 backup 3. renice -20 –u backup 4. renice 19 –u backup CorrectWrong! Correct answer(s): 3 Explanation: A value of –20 represents the highest possible priority, 19 is the lowest. The –u option of renice is used to denote all processes started by the given username. The command ‘nice –n-20 backup’ will attempt to run the command ‘backup’ with priority –20. [Management]

I believe this is incorrect, the following is directly from the man page of the renice command:

Quote:

Useful priorities are: 20 (the affected processes will run only when nothing else in the system wants to), 0 (the ââbaseââ scheduling priority), any- thing negative (to make things go very fast).

Not trying to be a jerk in anyway, just trying to make the already awesome service provided, even better.

Also I am humble enough to admit I may be wrong/misunderstanding of this, however I feel fairly confident I am correct. This is the reason I am posting this .

Thanks for the free tests!