单选题You have 2 NTP servers in your network - 10.1.1.1 and 10.1.1.2. You want to configurationure a Ciscorouter to use 10.1.1.2 as its NTP server before falling back to 10.1.1.1. Which commands will you use toconfigurationure the router？（）Antp server 10.1.1.1 ntp server 10.1.1.2Bntp server 10.1.1.1 ntp server 10.1.1.2 primaryCntp server 10.1.1.1 ntp server 10.1.1.2 preferDntp server 10.1.1.1 fallback ntp server 10.1.1.2
单选题
You have 2 NTP servers in your network - 10.1.1.1 and 10.1.1.2. You want to configurationure a Ciscorouter to use 10.1.1.2 as its NTP server before falling back to 10.1.1.1. Which commands will you use toconfigurationure the router？（）
A
ntp server 10.1.1.1 ntp server 10.1.1.2
B
ntp server 10.1.1.1 ntp server 10.1.1.2 primary
C
ntp server 10.1.1.1 ntp server 10.1.1.2 prefer
D
ntp server 10.1.1.1 fallback ntp server 10.1.1.2
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