What if the Client finds a Defect after delivering the product? How will you react and justify?

Though its normal that bugs will occur even after release, if the bug has high severity the testing team will be targeted for that for not doing testing thoroughly.
 
In such cases, the testing team has to make sure whether the particular scenario of the bug has been covered or not in their test cases (may be some times Requirements were not complete / accurate and test cases did not include something that should have been tested) and also the environment in which the bug has been reported is considered or not while doing testing 
 
Because the bug after release, will have a legal value depending on the terms and conditions between the client and the company, the testing team has to make sure the bug is not due to improper test coverage during testing cycle. the company can always go for bug-fixing depending on the contract terms. 

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