What is a feature of a dial-up connection?

• the use of multiple channels which can carry different types of services
• the use of different frequencies to carry voice and data signals on the copper telephone wire
• the use of an analog modem to transmit data over voice telephone lines
• the use of different frequencies to send multiple signals over the same medium

Explanation: Dial-up Internet connections use a modem to send data over analog telephone lines.

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