In a user-centered system, the distinction blurs between input, output, and the interface itself. The correct option is a.
What is a user-centered system?
A user-centered system is a programming system in which the users are put in the center to design the program which makes it user-friendly. When a team makes or designed a program, it makes it according to the requirements of the users.
The lines between input, output, and the interface itself are blurred in a user-centered system. By making a program user-friendly, the program actually helps the customers.
Thus, the correct option is a. user-centered.
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