case is approved - need to go for interview in India


My case is approved and now need to go for interview. I am in India.

Questions - whether I need to carry “original” approval notice (i-797) for the interview? Means, my attorney or employer will send me the original by courier from USA to India or just a printout will do?

What oother important documents I need to carry for the interview?

Thank you for your help in advance!