正解:B
The auditor's best recommendation prior to go-live is to conduct a mock conversion test. This is because a mock conversion test can help to verify the accuracy, completeness, and validity of the data conversion process. A mock conversion test can also help to identify and resolve any issues or errors before the actual conversion takes place. A mock conversion test can also provide assurance that the converted data meets the business requirements and expectations. References:
* CISA Review Manual (Digital Version), Chapter 3, Section 3.3.21
* CISA Online Review Course, Domain 2, Module 2, Lesson 22