Udin mandatory if ca attests unaudited financials?

Hi..

1.Assesse is not liable for audit under any act wherein CA signed on the financials-udin mandatory(yes/no)

2.Assesse filed under presumptive taxation wherein CA had separately provided financials with his seal and signature-udin mandatory(yes/no)

3.Ca singed financials for assesse's bank loan purposes-udin mandatory(yes/no)

pls respond to this at the earliest. urgently required this clarifications.

thanks in advance