Tier II withdrawal | NPS Trust

According to the above link the funds are credited on T+3 to the bank account. Does anyone know which NAV is used? T or T+3?
Notes:
a) I am assuming that online withdrawal is possible. Have not tried it out yet
b) The reason I am asking is because I sometimes plan to use Tier II as a "wallet" for DC offers. There will be the initial 0.2% contribution charge, but in an upward market you should recover that + missed interest (opportunity cost) within a few days. The only drawback I see is the date of the NAV, hence the above question
Thank you for your inputs