Universal Containers would like to conduct performance testing on its new major release.

The correct selection is A, B, C. Performance testing must be coordinated with Salesforce in advance, run in an appropriate sandbox, and may be monitored to protect the multitenant service. Large-scale testing should not be executed against production or launched without the required notice and test-plan coordination. From a testing perspective, the goal is deterministic evidence that the solution behaves correctly under the conditions that matter. Tests should isolate external dependencies, use controlled data, exercise positive and negative paths, and reproduce realistic volume or user behavior where required without making production the first place defects are discovered. The alternatives do not provide equivalent evidence: they either validate only a narrow implementation detail or depend on conditions outside the test ' s control. For this scenario, the decisive point is therefore the platform behavior represented by the selected options (A. Salesforce must be informed at least 7 days before starting performance tests.; B. Salesforce will monitor test activity to ensure there are no issues with Salesforce Services.; C. Performance tests must be run in a sandbox.). Applying that rule consistently keeps the implementation aligned with Salesforce-supported lifecycle practices and makes the resulting change easier to review, validate, and operate across environments.

Study Guide reference: Testing — Apex testing; test-data isolation; mocks; regression testing; performance/load testing; sandbox test strategy.