The correct answer is RJ11 connector is used to connect an analog modem to a telephone line socket.
RJ11: As previously mentioned, analog telephony made extensive use of RJ11 to link the phone and cable. It is still used in landlines today and is mostly used to connect to modems. It cannot fit into an RJ45 slot since it is a 4-slot connector with six pins. RJ11 connects to telephone equipment while RJ45 is typically used with Ethernet cables. RJ45 has eight wires inside, whereas RJ11 only has four. RJ45 is larger than RJ11 in size. The RJ45 cable connector can be plugged into an RJ11 jack, interface, port, or slot, but not the other way around.
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