ans should be option (1 )only
In computer science, test stubs are programs that simulate the behaviors of software components (or modules) that a module undergoing tests depends on.
||Test stubs provide canned answers to calls made during the test, usually not responding at all to anything outside what's programmed in for the test.
Test stubs are mainly used in incremental testing's top-down approach. Stubs are computer programs that act as temporary replacement for a called module and give the same output as the actual product or software.
Test Drivers are used during Bottom-up integration testing in order to simulate the behaviour of the upper level modules that are not yet integrated. Test Drivers are the modules that act as temporary replacement for a calling module and give the same output as that of the actual product.