i am closing my first investment property next month and searching for various options for downpayment. i am considering 3 options and need suggestions on which option would be better

1) sell some stocks (50% of amount) and borrow remaining 50% from 401k or

2) sell stocks for 100% amount or

3) HLOC 50% and 401k 50%

4) use all 3 of them

Also, would it be good to go with 30 years fixed vs ARM. I got 4.308 APR for 30 yrs fixed from builder lender (i haven't got the quote from him for ARM yet). is it a good idea to go with 30 yrs fixed or first close the loan with 30 yrs fixed and later refinance it.

Thanks in advance