To maintain confidentiality of different records within a database when employees access it using their personal mobile devices, it is critical to restrict access permissions. By implementing restrictions on what data can be accessed from mobile devices, the organization can ensure that sensitive or confidential information is only visible to authorized personnel and is not exposed unnecessarily. Regular remote wiping and encrypted data transmissions help protect data in different ways, but they do not specifically address the selective access to different records within the database. Two-factor authentication adds another layer of security but does not control access to specific records within the system.