What relationship is allowed from a technology function to an application function?

According to the ArchiMate® 3.2 Specification1, an application function describes the internal behavior of an application component, and an application component may be assigned to an application function, which means that the application component performs the application function. Therefore, the correct answer is A. Assignment. This relationship indicates that an instance of a technology function performs (part of) the behavior of an instance of an application function1.