Questions on MS Forms' questions and response (responses / questions deletion)

Hi,

I have questions re. MS Forms behavior, due to some response data security concern:

1. Let's say I created a forms consisting 10 questions. After certain response submission period, I then deleted 2 out of 10 questions. What will happen to the response submitted? Will it be automatically deleted from MS Forms server as well?

2. When I deleted a survey/form, what will happen to the response submitted? Will it be automatically deleted from MS Forms server as well?

3. For both of the above cases, is there any way to retrieve back/recover the submitted response? Who  will have ability to do that and see the recovered data?

Regards,

Fikri