Go back to 640-816 - ICND2 - Interconnecting Cisco Networking Devices Part 2

Question :-

Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?
Router(config-if)# ppp authentication chap fallback ppp
Router(config-if)# ppp authentication chap pap
Router(config-if)# authentication ppp chap fallback ppp
Router(config-if)# authentication ppp chap pap

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