Proof of funds required to confirm PR

[Anks86]

Hi, I am looking for some clarification regarding proof of funds required to be provided at the border while getting your PR confirmed. I am the primary applicant and my wife a secondary applicant on our profile. There is a chance I might end up going alone to confirm my PR and my wife travels afterward.

1. Can money in my retirement (401k), IRA accounts be shown as proof of funds without liquidating them?
2. Alternatively, my wife holds a brokerage account at Robinhood. I am wondering if they would consider a brokerage account (funds could be liquidated in 3-5 business days) as proof of funds?
3. If that is not advisable, and we liquidate our holdings in Robinhood, and transfer that to my savings account to be shown as proof, could that cause any problem since stocks were sold from my wife's account and the money from liquidating them was moved into my savings account?
4. If we liquidate our stocks and plan to travel to confirm our PR in less than a month from now, the cash transaction in our savings would be less than a month old. Could that cause any issue?

I am really looking for some guidance here.

Thanks.