What does regression testing aim to achieve?

Regression testing primarily focuses on ensuring that recent code changes, such as updates, enhancements, or fixes, do not disrupt the functionalities that were previously functioning as intended. This aspect of software testing is critical because it helps identify any unintended consequences that may arise when new code is integrated into the existing system.

As software evolves, new features or modifications can inadvertently affect existing components. Therefore, regression testing validates that the overall system still works as expected after any changes. It serves as a safeguard, ensuring that the integrity of the application remains intact.

The other options touch on various aspects of software testing or project management but do not align with the core objective of regression testing. For instance, checking system performance under load pertains to performance testing, and testing the system's behavior without internal knowledge relates more to black-box testing. Maintaining project management records is outside the realm of testing practices altogether.