What could cause software not to work when brought up from recovery during a data center failover?

The correct choice is focused on the necessity of adjusting software configurations when transitioning from a primary environment to a disaster recovery (DR) environment. In a data center failover situation, the software may rely on specific settings or configurations that are suited for the original environment, which might be different from those required in the DR setup.

Various factors can contribute to this need for configuration changes, including differences in network settings, database connections, or even the operating system environment. If these configurations have not been adapted to fit the DR context, it could lead to failures in the software functioning properly. Therefore, ensuring that all relevant configurations match the requirements of the disaster recovery environment is crucial for successful operations post-failover.

The other factors listed, such as recovery failure, conflicting laws, and data loss, while they may impact the overall success of a disaster recovery effort, do not specifically address the software's operational requirements in the DR context as directly as the need for configuration adjustments does.