Which of the following is a type of QA testing?

Sanity Testing is indeed a recognized type of quality assurance (QA) testing. This type of testing is conducted to determine whether a particular function or bug fix works as intended after changes have been made to the application. It aims to confirm that the changes made do not break any existing functionality and that the new functionality is functioning properly.

Sanity Testing often follows a more extensive set of testing and focuses on a specific aspect of the application. This makes it an essential step in the QA process since it helps identify any immediate issues introduced by recent changes or bug fixes, allowing for quick feedback to developers before further testing proceeds.

The other options, while also types of testing in the broader field of QA, do not align with the question's focus on identifying a type of QA testing specifically in the context often associated with rapid checks on functionality.