The default "nice level", which is set for processes started using the nice command in Unix systems, is 10. This means that if you start a process using the nice command without specifying the "nice" value, the process will receive a "nice" value set to 10.
niceness values range from -20 (most favorable to the process) to 19 (least favorable to the process).
-n, --adjustment=N ==> add integer N to the niceness (default 10)
I don't know, if we think about the test, I would say that the answer could be B - 0.
https://learning.lpi.org/en/learning-materials/101-500/103/103.6/103.6_01/
Process Niceness
Every normal process begins with a default nice value of 0 (priority 120).
C, a very easy way to test:
run a "top" (as root user) and see the own top niceness, as many processes it is 0.
then quit and run "nice top", will see the top niceness changed to 10
The nice command, when run without arguments, will output the priority for the
currently logged-in user, which is normally 0. The renice command can be used to change
the priority of running processes. The other two commands shown as options for this
question do not exist
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