The correct answer is Uplink.UplinkA term relating to sending data to a satellite is known as Uplink.The communication going from a satellite to ground is called downlink, and when it is going from ground to a satellite it is called uplink.When an uplink is being received by the spacecraft at the same time a downlink is being received by Earth, the communication is called two-way.If there is only an uplink happening, this communication is called upload.If there is only a downlink happening, the communication is called one-way.DS1 has a constant downlink going to Earth sending little bits of information.However, most of the communication is done two-way with the Deep Space Network.Additional InformationModemA modem is hardware that connects to a computer, broadband network, or wireless router.A modem converts information between analog and digital formats in real-time making seamless two-way network communication.The full form of Modem or modem stands for modulator-demodulator.Modulations are performed to extend the frequency of the signal for propagation for production purposes, whereas demodulation is performed at receiving purpose to bring down the signal to its original level.Optical fiber Cable:Optical Fiber is the type of guided media is made of plastics and glasses which are used to transmit the signal is in a light form optical form.It provides high bandwidth (B).Its Installation and implementation are not so easy as a coaxial cable.Coaxial Cable:Coaxial Cable is the type of guided media is made of Plastics, copper wires which are used to transmit the signal are in electrical form rather than light form.Its installation and implementation are easy but it is less efficient than optical fiber also it provides moderate-high bandwidth (B) in comparison to the optical fiber.