Which of the following describes the actual users who interact with one another, a system,...

 The user interface is the part of a system that allows the actual users to interact with one another, the system, or data moved between two users. The user interface is the means by which the users can input, view, manipulate, or output information through the system. The user interface can be graphical, textual, auditory, tactile, or a combination of these. The user interface is an important aspect of the user experience and usability of the system. The user interface should be designed to meet the user needs, preferences, and expectations, as well as the system requirements and constraints. References: IIBA BABOK Guide v3, section 9.1.2, page 326; CBAP / CCBA Certified Business Analysis Study Guide, chapter 7, page 251; CBAP Exam Questions - Institute i4, question 241.