When using an integrated test facility (ITF), an IS auditor should ensure that:

A. production data are used for testing.

B. test data are isolated from production data.

C. a test data generator is used.

D. master files are updated with the test data.

Explanation:

An integrated test facility (ITF) creates a fictitious file in the database, allowing for test transactions to be processed simultaneously with live data. While this ensures that periodic testing does not require a separate test process, there is a need to isolate test data from production data. An IS auditor is not required to use production data or a test data generator. Production master files should not be updated with test data.