单选题During role-based CLI configuration， what must be enabled before any user views can be created？（）Amultiple privilege levelsBusernames and passwordsCaaa new-model commandDsecret password for the root userEHTTP and/or HTTPS server
单选题
During role-based CLI configuration， what must be enabled before any user views can be created？（）
A
multiple privilege levels
B
usernames and passwords
C
aaa new-model command
D
secret password for the root user
E
HTTP and/or HTTPS server
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