The acceptance criteria for a sprint are the conditions that must be met for the user stories to be considered done and deliver value to the customer1. The acceptance criteria should be specific, measurable, achievable, relevant, and testable2. In this case, the plan for the sprint is to increase performance of the system, so the acceptance criteria should reflect that goal. Therefore, the acceptance criteria that would be expected for Sprint 5 are:

100% of the existing regression test suite has passed. This criterion ensures that the system has not introduced any new defects or broken any existing functionality while improving performance3.

System is responding in less than 3 seconds, 90% of the time. This criterion defines a clear and quantifiable performance target that can be verified by testing4.

The other options are not relevant or appropriate acceptance criteria for Sprint 5:

User access for all roles has been validated. This criterion is not related to the performance of the system, but rather to the security or functionality of the system. It might be an acceptance criterion for a different sprint or user story, but not for Sprint 55.

A static analysis tool has been executed for all code. This criterion is not a customer