Imagine that you are designing a system which requires a user to complete an online form. One of the principles of good interface design is to offer informative feedback. How would you, the designer, handle invalid input entered by the user? Select one.Imagine that you are designing a system which requires a user to complete an online form. One of the principles of good interface design is to offer informative feedback. How would you, the designer, handle invalid input entered by the user? Select one.