Cannot uncheck answer

[kkleba16]

In 4.1, once the answer has been checked, then it cannot be unchecked.
This is problematic, if the instructor needs to check the answer in order to verify the correct answer before they start a discussion based on the participants' responses.
If they were to share the screen to show the overview of responses, then it will prematurely reveal the correct answer and ruin the potential discussion.

Additionally, it would be nice to have the option to check answer, while participants are answering the question so the instructor can prepare themselves.