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What is the gesture that can be produced by tapping index finger to the tip of your thumb?

(a) Pressing a virtual button

(b) Twisting a virtual dial

(c) Pressing a virtual button and Twisting a virtual dial

(d) Neither Twisting a virtual dial nor Pressing a virtual button

The question was asked in examination.

I would like to ask this question from Taking Control of Gesture Interactions topic in section Designing for IoT of IOT

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The correct answer is (a) Pressing a virtual button

Explanation: Example of soil intuitive virtual tools, by tapping your index finger to the tip of your thumb, you can simulate pressing a virtual button.

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