Which of the following requirements did the testing plan for the SaaS timecard application confirm?

The requirement that the testing plan for the SaaS timecard application confirmed is performance because this aspect directly relates to how well the application functions under various conditions. In a SaaS (Software as a Service) context, performance testing is crucial to ensure that the application can handle the expected load and respond promptly to user interactions, which is vital for user satisfaction and retention.

Performance testing generally includes assessing load times, transaction speeds, and overall responsiveness to ensure that the application delivers a smooth user experience, especially during peak usage times. This kind of testing helps identify bottlenecks or issues that could hinder the application’s ability to meet users' needs effectively.

While high availability and data integrity are also important factors in a testing plan, the focus of performance testing specifically hones in on how the application executes its tasks efficiently and effectively in real-world scenarios. Sizing refers to the assessment of resource allocation, which is important but isn't the primary focus when confirming performance characteristics. Therefore, confirming performance as part of the testing plan is essential to ensuring a reliable and efficient SaaS application.