Who is responsible for business and IT sanity testing post deployment to production?

The implementation team is responsible for business and IT sanity testing post deployment to production. Sanity testing is a type of software testing executed on the stable build of an application with minor code changes. It is also known as surface-level testing. A sanity test is performed to ensure the application works as expected after the bug fixes or changes in the code1. The implementation team, which consists of developers, testers, and business analysts, conducts sanity testing to verify the functionality and performance ofthe application after deployment2. The project manager, the Salesforce support team, and the customer are not directly involved in sanity testing post deployment.