The client, after the development of the software asks the testers to provide allthe possible combination of inputs and conditions that the team would betesting to validate the product and also asks assurance for 100% bug freesoftware

Ideally none of the software can ever be claimed to be bug free. In
accordance with software principal ‘Exhaustive testing is impossible’ principal  justifies this which state that it’s not possible to test all the possible combination  of all the data sets and only data sets prone to high risks should be  considered.