What are the requirements for bank statements when applying for the DTV visa in Laos?

Dear brothers & sisters,

I’m planning to go to Laos from Vietnam.

I’ll apply soft power DTV in Laos.

I would like to know that

1, The money above 500,000 have to be the last 3 months continuously?

Or

Is it ok for the last one month or the last two months to apply from Laos?. My money is above 600000 which is the latest one and half months up to now.

2, The bank statement have to be from the bank with manager signature & bank seal?

Or

Is it ok print from ibanking pdf?

Could you please share from your experience. So that, I can prepare in advance if necessary.

Thank you very much.