Which of the following testing strategy was devised for testing real-time systems?

Explanation

Important Points Thread testing Thread Testing is one such type of software testing that is usually conducted during the early stages of System Integration Testing. This type of software testing technique is immensely useful in scenarios where an application is of a type that uses a client-server architecture. Thread testing is a vital part of integration testing and is usually performed for testing real-time systems. The main focus of this type of testing is to check the data communication amongst the multiple modules coded by different programmers. Additional Information Bottom-up testing It is an approach to integrated testing where the lowest level components are tested first, then used to facilitate the testing of higher-level components. The process is repeated until the component at the top of the hierarchy is tested. Back-to-back testing It is a type of testing which is conducted if there are two or more variants of components with similar functionality. It is also called Comparison Testing. The aim of back-to-back testing is to compare the results to check if there are any divergences in the work. Top-down testing It is an integration testing technique used in order to simulate the behaviors of the lower-level modules that are not yet integrated. Stubs are the modules that act as temporary replacement for a called module and give the same output as that of the actual product. Hence Option 4 is correct