In the early days of networking, the most common way to transmit data was via (Option D.) switched, dial-up telephone lines.
The most common way to transmit data in the early days of networking was through switched dial-up telephone lines. In this method, a user would connect to an ISP (Internet Service Provider) using a modem and a telephone line, and then the data was transmitted through the switched telephone line. This was a fairly reliable method of data transmission, although it was slow and limited in capacity. As technology improved, it was eventually replaced by faster data transmission techniques such as:
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