ASKWB

Please give me some information about viva , I already download the call letter there clearly mention that all credential document carry for viva with self attested but some-one told me that all document need to submit via email . Actually I confuse that all document I will submit in ballyguange place or viva center where interview venue already mention in my call letter.
Also told me that if need to mail all document the give me email id where I can submit the document.
Plz revert asap. I am waiting for your replay.