What is a feature of a dial-up connection?

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Question:
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.