ANSWERS: 1
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T3 lines are the fastest Internet service. They're around 30 times faster than T1 lines. However, T3 is expensive and usually used only by businesses. Another drawback to this service is that it's not available everywhere; however, it does increase security and allows multiple users to use the service at the same time.
Source:
techsoup.org: Comparing Internet Access Options
broadbandinfo.com: What Are T1 and T3 Internet Connections and Who Uses Them?
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