Last four of social is so abused it shouldn't count, and date of birth is in nearly every company's loyalty database. That leaves drivers license and state ID number as the leaked data. I'm honestly not sure how important or secure those are.
Yet it does. Almost every single business/government service in America uses DoB + last 4 SSN to identify you. The two together make fraud trivial.
Before you answer, you may want to poke your answers into this site and have a look at the outcome: https://www.ssn-check.org/lookup/
Caveat: This tracks your issue date, not truly your birthdate. In the past couple of decades many/most babies get registered at birth, but if I stick my own (birth) data in there I actually get the wrong answer, because when I was born issuance wasn't automatic yet. But that will work for a lot of people.
https://www.ssa.gov/history/ssn/geocard.html
Anecdotally, while bored in math class we figured out that 10 or so of the guys in the class had one of two numbers for their first three.