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The 10Base-T standard, which refers to a type of Ethernet networking technology, is defined by its speed and cable specifications. One of its fundamental characteristics is its operational speed of ten megabits per second. This defines the data transmission rate of networks that adhere to this standard, making option B an accurate representation of the 10Base-T specification.

In addition to speed, the 10Base-T standard also specifies a maximum cable distance. Although it's not the answer chosen, it's important to note that this standard supports a maximum cable distance of 100 meters using twisted-pair cabling, which is crucial for maintaining network performance over larger areas. This standard is particularly suited for office environments where twisted-pair cables can be utilized effectively.

The two characteristics emphasize the fundamental parameters defining how networks operate under the 10Base-T standard, specifically focusing on its transmission speed and supported cable length, which have broad implications for network design and implementation.