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What are the key components of a M2M system?

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What are the key components of a M2M system?

(a) Vortex DDS

(b) Smart Homes

(c) Sensors and Wi-Fi

(d) Protocols

I had been asked this question in an international level competition.

The above asked question is from MQTT Protocol in division Internet Principles of IOT

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Correct option is (c) Sensors and Wi-Fi

Easy explanation: Following are the key components of a M2M system.

Sensors

RFID (Radio Frequency Identification)

Wi-Fi

Autonomic Computing.

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