Universal Containers has deployed a Service Agent to production that handles billing, returns, and technical...

The correct answer is C because the issue appeared after a subagent instruction change, so the specialist needs repeatable regression testing rather than ad hoc manual testing. Agentforce Testing Center supports structured test cases and batch execution, which allows the team to rerun the same stored scenarios against the modified agent and compare expected versus actual routing and action behavior. Reviewing subagent and action evaluation results isolates whether the regression is in subagent classification, action execution, or both. Option A relies heavily on production review after users are already affected. Option B is too manual and cannot reliably confirm the full impact across many billing, return, and support paths. Salesforce Testing Center guidance supports CSV-based and batch testing, plus evaluation of subagent and action assertions.