What device includes an adapter that decodes data sent in radio signals?

The correct answer is A. Modem.

A modem is a device that converts digital signals to analog signals and vice versa. This is necessary for communication over telephone lines, which are designed to carry analog signals. The modem converts the digital signals from your computer into analog signals that can be transmitted over the telephone line. At the other end, the modem converts the analog signals back into digital signals that can be read by your computer.

A digital translator is a device

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