What is one of the strategies used for disaster recovery?

Parallel processing refers to the simultaneous execution of multiple processes or tasks, which is primarily a performance optimization technique rather than a disaster recovery strategy. While it can enhance system efficiency and speed, it does not specifically address the need for data backup or recovery in the event of a disaster.

User authentication is a security measure designed to verify the identity of users before granting access to systems or data. Although crucial for protecting data integrity and privacy, it does not contribute to disaster recovery efforts, as it does not involve data preservation or restoration strategies.

Data encryption is the process of converting information into a secure format to prevent unauthorized access. While it is vital for data security and confidentiality, it does not serve as a disaster recovery method. Encryption does not ensure that data is backed up or recoverable in the event of a disaster.