Which unit measurement indicates a transfer rate of 1 million bits per second?

The correct choice indicates a transfer rate of 1 million bits per second, which is represented by the term "Mbps," or megabits per second. In networking and data transfer contexts, the prefix "mega" signifies one million. Therefore, when you see Mbps, it directly translates to a speed at which data is transmitted, specifically that one million bits are moving every second.

To clarify the other possible choices: "Kbps," or kilobits per second, relates to a transfer rate of 1,000 bits per second. "Gbps," or gigabits per second, designates a much higher transfer rate of one billion bits per second, and "Tbps," or terabits per second, corresponds to an even higher rate of one trillion bits per second. These distinctions highlight the increasing scale of data transfer rates, with Mbps sitting squarely as the measurement for one million bits per second.