A customer calls your ISP’s technical support line, complaining that his connection to the Internet usually goes as fast as 128 Kbps, but today it is only reaching 64 Kbps. He adds that he has tried dialing up three different times with the same result. What type of connection does this customer have?
a. PSTN dial-up
b. DSL
c. ISDN
d. T1
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