Progressive places its messages on local radio stations and in the yellow pages of the phone book. these communications are directed at the the person who will decode the message.

Receiver

Explanation:  

The receiver basically is used in the communication channel where the person decode its output and message in the form of useful data or information.

The main function of the receiver is to provide the path between the transmitter as an output and receiver as an input. The receiver basically process the received signal for recovering the proper message signal. It basically receive the input signal and covert it into useful data.

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that without the operating systems you would have to control and synchronize computer hardware.