Interested in opening an itrade account. As part of the CDS registration, it is saying that it needs EA form/ bank statement/ payslip For statement, can I provide a printed PDF version? Do I need to get the certified true copy for bank statement?

Want to ask ah, if i buy and sold all 1 company stock right, will it still appear under my portfolio ah? What if i can see negative balance in hand for something i have sold? normal?