Role-based access control (RBAC) in data masking ensures __________ by restricting access to sensitive data.

Option C is correct because role-based access control (RBAC) ensures improved data security by limiting access to sensitive data based on users' roles and responsibilities. This helps prevent unauthorized access and potential data breaches. RBAC is an essential security measure in data protection strategies, especially in environments handling sensitive information. Understanding RBAC's role in data security is crucial for implementing effective access control mechanisms.