Which Encryption Level Does a SDAIA Auditor Accept?

Three levels, not one

Infrastructure encryption protects the machine, not the person. Database-level is a second option. Column-level is a third. All three exist, and the real question is which one fits your situation.

How to actually decide

The right standard isn’t "encrypt everything at the highest level available." It’s matching the protection level to each column’s own classification. A national ID number needs far stronger protection than a city name does, and that distinction is exactly what a column-level classification engine produces, rather than one that treats a whole file as a single unit.