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单项选择题 While troubleshooting a serial line problem, you enable ppp authentication debugging as shown below: Based on the command output above, what type of 'handshake' was used for PPP authentication?（）

A、one-way

B、two-way

C、three-way

D、four-way

E、no handshakes required during authentication

F、None of the above

  • C

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