Point out the correct statement.

Question: Point out the correct statement.

1.MEMS is a class of very small sensor or actuator devices where small mechanical systems are driven by electricity to indicate a position

2.The incorporation of low-cost geo-sensors in the form of GPS chips into mobile devices opens the mobile user to a whole range of services based on the client’s location

3.The iPhone uses the proximity sensor to turn the screen off when a user puts the phone to his face

4.all of the mentioned

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