Which of the following types of WAN service would provide the BEST connectivity to the PSTN?

A VoIP system will require 23 concurrent voice channels and one signaling channel. Which of the following types of WAN service would provide the BEST connectivity to the PSTN?
A. PRI
B. BRI
C. E1/E3
D. DSL

Exam N10-008: CompTIA Network+

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