Regarding the command: nice -5 /usr/bin/prog Which of the following statements is correct?

Executing with a nice level of -5 would require `nice -n -5`, and generally needs root privileges; `nice -5` as provided means to add 5 to the nice value.

When `nice` is used with a positive number, such as `nice -5`, without the `-n` option, it is interpreted as `--adjustment=5`, meaning it adds 5 to the program's default nice value (which is 0). Therefore, `/usr/bin/prog` will be executed with a nice level of 0 + 5 = 5, assigning it a lower scheduling priority.

Nice levels are an input to the scheduler that *influence* priority, but are not directly the priority value itself; a nice value of 5 means a *lower* scheduling priority, not a priority of -5.

Nice levels are an input to the scheduler that *influence* priority, but are not directly the priority value itself; a nice value of 5 means a *lower* scheduling priority, not a priority of 5.