Multiple 3520 forms for both inheritance and trust income?

I have 3 trust income sources to report which is same as past year. In addition, I also have a one time  inheritance of more than $100k in 2023. This bequest  is not a trust but from an individual UK citizen (not a US taxpayer).

 

1. Should the inheritance info be submitted on its own separate 3520 form with only part IV completed? (The 3 trusts already each have separate 3520 forms)?

 

2. For the preamble check boxes on page 1 section C , do I check both the 3rd and 4th boxes repeated on all 4 of the 3520s, or just the single check box that pertains to the trust income or bequest in question?

 

IRS instructions are not clear here as the form looks like an amalgamation of multiple foreign income use cases. Thanks