They say the surveys are anonymous, but you will have to log in to get access to the survey.
If you want to be laid off, or punish your immediate manager, then score everything low.
If you need to keep your job and do not want to harm your immediate manager, then score everything high.
Not Applicable does not benefit nor harm your immediate manager.
That part only applies to the scores. What you write is a different matter. Every comment gets read. This is your once a year chance to send a message to all managers above you. If you want to say that someone is a Jerk, you can call them out by name. I find it is best to ignore the prompt and just write whatever you want in the text area.
If you want to become a poet or write fiction, now is your chance to have a captive audience.