Universal Containers wants to delete the day ' s test data in a partial copy...

The correct selection is B. A scheduled Batch Apex cleanup job can delete the day ' s roughly 1 GB of test records in scalable chunks. A Partial Copy sandbox cannot be refreshed nightly under the normal refresh interval, and manual deletion or nightly sandbox recreation would be inefficient and operationally fragile. 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 rejected choices either test the wrong layer, introduce live-system dependencies, or detect problems too late to provide the deterministic early feedback expected from a mature test strategy. For this scenario, the decisive point is therefore the platform behavior represented by the selected option (B. Execute a batch job that deletes all records created on the day.). 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.