Refer to https://docs.google.com/document/d/1gfwVdVdN54OeWzl_fiCP8ZY-Taz1lsrnTcFI1zNWNhU/edit?usp=sha ring Apex wants to evaluate whether the new Copilot implementation improves infrastructure-change quality after Planned changes 1 through 5 are implemented. Leadership does not want a metric that rewards only the number of Copilot-created pull requests. Which evaluation set best matches Apex’s requirements? Select one answer.

The correct answer is "Track plan drift, policy blocks, checks, rework, and validation time" because these metrics directly assess the quality and efficiency of infrastructure changes, aligning with the goal of evaluating Copilot's impact beyond just pull request volume. Plan drift indicates how much the actual implementation deviates from the original plan, a key quality indicator. Policy blocks show if changes are adhering to organizational policies. Checks (e.g., CI/CD checks) and rework quantify the effort needed to fix issues, reflecting initial quality. Validation time measures how long it takes to confirm changes are correct and stable. The other options are less suitable: "Count eyes reactions, generated branches, and issue labels" are engagement or activity metrics, not direct quality measures. "Measure prompt length, comment volume, and file count" are related to development activity, not necessarily the quality or correctness of the infrastructure changes themselves. "Compare draft PR titles with Terraform module names" is too specific and doesn't provide a comprehensive view of change quality.