There can be multiple Catches and, in case of an exception, only the most specific Exception will be caught and its handler executed. In this case, UiPath.Core.SelectorNotFound is the most specific exception.
Activities in Finally to be performed after the Try and Catches blocks are executed. This section is executed only when no exceptions are thrown or when an error occurs and is caught in the Catches section. So in this case, Finally block is executed, as the exception was caught.
UiPath Documentation
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Exam Topic: Identify and describe the use of the error handling activities such as Try Catch, Throw, Rethrow, Retry Scope, and Global Exception Handler