The slowest transmission speeds are those of twisted-pair wire. Twisted-pair wire is a type of cable made up of two copper wires twisted together. It is commonly used for telephone lines and Ethernet networks. However, it has a relatively low bandwidth and is susceptible to interference from other electronic devices and nearby cables. As a result, it is typically used for low-speed data transmission over short distances. Coaxial cable is a type of cable that consists of a central conductor surrounded by a layer of insulation, a metallic shield, and an outer sheath. It is commonly used for cable television and high-speed internet connections, and can support higher bandwidths and longer distances than twisted-pair wire. Fiber-optic cable is a type of cable that uses thin strands of glass or plastic to transmit data using light. It is capable of very high bandwidths and long distances, making it ideal for high-speed data transmission over long distances. Microwaves are a type of electromagnetic radiation that can be used to transmit data wirelessly. They are commonly used for communication between satellites and ground stations, and for wireless point-to-point communication. They can support high bandwidths and long distances, but their performance can be affected by atmospheric conditions. Therefore, the correct answer is (a) twisted-pair wire.
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