https://learn.microsoft.com/en-us/dotnet/api/system.security.cryptography.pkcs.subjectidentifiertype?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
SubjectIdentifierType Enum (System.Security.Cryptography.Pkcs) | Microsoft Learn
The SubjectIdentifierType enumeration defines the type of subject identifier.
system securityenumcryptographypkcsmicrosoft