Which test and verification tool supports traceability with classified training data?

A traceability matrix / requirements traceability tool is typically used for this, and if you mean a specific test and verification platform, a common choice that supports traceability for classified training data is IBM Engineering Lifecycle Management (ELM).

If you meant a different tool category (for example, ML model testing, requirements management, or compliance audit tooling), tell me the context and I can narrow it down.