[单选]
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

框选多个对象，执行分布命令，结果是（）以最下面的对象的位置为基准进行分布。以最上面的对象的位置为基准进行分布。以中间的对象的位置为基准进行分布。以两边的对象的距离的平均值为基准进行分布。棍棒打击人体可形成（）中空性皮下出血。条状挫裂创。内脏碎裂。颅骨的线状或舟状骨折。论述认证机构的责任。脱硫吸收塔一般划分在（）中。烟气系统；。吸收/氧化系统；。公用系统；。吸收剂制备系统。。垃圾堆放场

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?（）

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[单选] 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?（）

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[单选]
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?（）