1. I am a F-1 student graduating in May 2021. An employer "X" wants to e-register me for the H1B lottery and I am hoping for a better offer from employer "Y". Suppose I got selected in the H1B lottery filed by "X". Can I start working for employer "Y"? What are my options to work for employer "Y"?
2. Can employer "Y" file my H1B petition even though I was registered in the lottery by "X"?
3. Can I ask "X" to not file an H1B petition after winning the lottery and use F1-opt as work authorization?
4. I am also applying for F1-OPT. Can I use my F1-opt to work till September for "Y" and then use H1B in October to work for "Y" while it was filed by employer "X"? I believe "X" would send an H1B petition with change of status.