Student asylum seeker. CoS Category and tier?

Hi all... Can someone help me? Please?
I came in uk as student but later i claimed asylum. My asylum is decision is pending.
My University CAS end date is complete.
On my BRP and ARC is stated " work is permitted student "
Now i am switching to skilled work visa but my employer is confused about what is my category and tier COS?

Employer see the following options:
1) Skilled Worker (Switching immigration Category -ISC liable)
2) Skilled Worker (Switching immigration category - ISC exempt)
3) Skilled Worker (graduate in Tier 4/Student Route switching to skilled worker)

Someone told me that is option 3?
Is that correct?
Thank you
Take care

Hi all... Please anyone answer the question... ..
Thank you...
Regards