Each button has same height and width because they are . . . . . . . . the interface.

The correct answer is: C. Clustered.

Buttons are clustered when they are placed close together in a group. This can be done to make them easier to find and use, or to create a visual effect.

• Stacked buttons are placed one on top of the other. This can be done to save space, or to create a sense of hierarchy.
• Queued buttons are placed in a line, one after the other. This can be done
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