You are troubleshooting a WAN connection for TestKing, and on the router you execute the, "debug ppp authentication" command, and view the following output:<img src="https://nimg.ppkao.com/2018-07/longzhengxuan/2018073014041429164.jpg?sign=c541a6836b7028b39477421cae5f8128&t=62d4b736" /><br /> What kind of handshake was used for the PPP authentication?()
A、one-way
B、two-way
C、three-way
D、No handshakes required during authentication
E、None of the above