Which kind of data can customers mask for use in partner or development environments?

Masking sensitive data is crucial for maintaining privacy and compliance with regulations such as GDPR or HIPAA when sharing information in partner or development environments. Sensitive data typically includes personally identifiable information (PII), financial records, or any details that, if disclosed, could lead to privacy violations or identity theft.

Customers can implement data masking techniques to obfuscate sensitive information while retaining the data's usability for testing or partner environments. This ensures that while development activities can proceed, the actual sensitive data remains protected and is not exposed to unauthorized access.

The other options, while they mention different types of data, either lack the necessary focus on sensitiveness or may imply sharing of data types that should remain protected under standard data governance and privacy practices. Thus, the emphasis on masking primarily applies to sensitive data, making it the appropriate choice for these scenarios.