Which one is NOT a function of integration testing

Question $7$Answer

a$.$

tests interfaces between components, interactions to different parts of a system such as an operating system, file system and hardware or interfaces between systems

b$.$

supposes that the test objects subjected to it have already been tested

c$.$

checks if groups of components collaborate in the way that is specified by the technical system design

d$.$

to detect failures in the components, verifies whether the mode of operation of the component, module, object, etc is functional or non$-$functional