Transmission Rate is the speed at which data travels over a communications channel, typically expressed in bits or bytes per second.

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Transmission rate is the speed at which data are transmitted onto the communication channel, typically measured in bits per second or bytes per second. This directly matches the description given, making it the best choice. Latency refers to the delay of a data unit traveling from sender to receiver, not the speed of transmission. Bandwidth often means the channel’s capacity or maximum possible rate, which is about potential rather than what is actually sent. Throughput is the actual rate of successful data delivery, which can be lower than the transmission rate due to overhead, errors, or other inefficiencies.