Which of the following describes a use case for the public cloud?

The use case for the public cloud is best described by leveraging computing resources to establish secondary infrastructures for disaster recovery, data protection, and business continuity. Public cloud services are designed to provide on-demand resources that can be rapidly scaled and adapted to meet varying demands.

In this context, utilizing the public cloud for disaster recovery means that businesses can create backups and failover systems without the need for significant capital investment in secondary physical infrastructure. The flexibility and scalability of public cloud solutions allow organizations to quickly recover data and applications in the event of a disaster, ensuring minimal downtime and continuity of operations. Additionally, data protection measures such as automated backups and redundant systems can be efficiently deployed within a public cloud framework.

The other options reflect scenarios where the public cloud may play a role, but they do not specifically highlight the distinct advantages of public cloud computing related to disaster recovery and business continuity as clearly as option D does. For example, while options related to application flexibility, integration, and modernization are important, they primarily address application development and optimization rather than directly addressing the critical goals of safeguarding data and ensuring resilience against disruptions.