Nothing to be honest. They ask normal questions like what do you do and all that. Nothing specific, our interview was very short … no prep is needed, there is a high chance if someone is from some countries they’ll be hit as far as I’ve heard. Hope that doesn’t happen to you but if it does the timeline is not clear unfortunately. They told us a few weeks but it’s been a few months now and many people on other forum had similar experience. I’d say don’t worry much and answer questions they ask with your best knowledge. I don’t think anything I answered triggered the form, it’s most likely where I was born as people say, so they need to do their background check and make sure my history was clean before issuing the Visa. I believe this is something typical.