I am going to the US on a B-1 visa to attend a conference. On the DS-160 form, it is asking for a US SSN (Social Security Number) and TIN (Taxpayer Identification Number).
Previously, I was an international student who graduated and did my OPT (Optional Practical Training) for one year. I was given an SSN for that work authorization.
Will this SSN still be valid or should I leave that as "not applicable" because it was tied to that OPT?