When returning an assignment, allow the teacher to clear all answers before returning

I like that you have fixed it so that we can return assessments, quizzes, etc., but there needs to be an option for when it is returned there is a check box or something that says clear answers before returning. I like it that sometimes it is fine for me to return the item with the answers still there, but there are other times I need the answers cleared before returning the item. This is helpful to both teachers and students because sometimes we want the students just to redo the ones they missed. However, in other cases especially on tests, if I am allowing the student to take the test again, I want the answers cleared out so the students can start all over.