A defined benefit plan is a type of qualified retirement plan. It would require a written plan agreement and the naming of a fiduciary; e.g. a bank with trust powers.
A QRP might purchase a time deposit as an investment or open a checking account as a method of making distributions. Like any other customer, you would require evidence of existence, a taxpayer identification number, etc.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.