H1b visa /got i-797C-

Hi Experts,

I was selectd in the lottery , i got a I797C with the recipt number as well./what is exactly that.do i qualify?

now my candidature is in “respnse of RFE receivd”.

Now my doubt is that whether I797C is a related to any type of rejection.

whether my canddature has been rejected or not.

What are all the documents required when we ar going for interview ( both from employee & employers side}

Please do advice

regards

prpr