So, if you want something anonymous, then you really shouldn't be able to reply - if it is generic feedback, you might just add a forum and add the students' questions there with your feedback so that everyone can see it as they might have the same question. It adds an extra step of copying the comment/question from the feedback activity but would give the student the idea that their feedback is anonymous...which it really isn't unless you add the feedback on the front page and make it accessible to guests...
Feedback
How to respond to student feedback?
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