Haseo

Hi, I just recently signed up though I always visit this forum for answers few months back but this time, it seems that I can't find what I'm looking for. Our visa category is F1 (Family-based, not the student one), Unmarried Son/Daughter of US Citizen, and our original interview was on May 13. My mother was already interviewed on that day, btw, she is the principal applicant and I'm a derivative and not interviewed yet since I have to undergo sputum test, so here are my questions: 1. When I logged in to ustraveldocs to reschedule my interview online and came to the point where you need to select a visa category, there's no option for F1, all I can see is the F11, but seems to be the same as F1, so are these visa categories just the same? 2. On my scenario where I'm just the one, as a derivative applicant, who needs to reschedule my appointment, should it be safe to choose the F12 visa (child of F11), of course if the answer to Q#1 is yes or should I just choose F11 as well? 3. Does choosing the right visa category for rescheduling online vital? (I just asked cause I tought they already have these info but still, I'm afraid to make mistakes) It may sound like I already know the answer but I'm not really sure since I'm just new to these things, so I'm asking for your guidance and clarify things up.