Point out the correct statement.
(a) MEMS is a class of very small sensor or actuator devices where small mechanical systems are driven by electricity to indicate a position
(b) 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
(c) The iPhone uses the proximity sensor to turn the screen off when a user puts the phone to his face
(d) All of the mentioned
I have been asked this question in an interview for internship.
Question is taken from MEMS in chapter Mobile Cloud and Mobile Web Services of Cloud Computing