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Internet addressing protocol

Problem

A school installs four smart sensors that can detect vaping. The sensors are connected to the Internet so that district administrators can visit a password-protected website and view data in real-time. The administrator can also send a command to a sensor to trigger an alarm mode.
According to the Internet Protocol (IP), each sensor must have a unique identifier so that it can send and receive data over the Internet.
Which table shows identifiers that could be used by IP to identify the sensors?
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