What is a feature of a dial-up connection?

What is a feature of a dial-up connection?

• 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
• 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
  

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