[单选题]23. Which is the default authentication scheme used by the DefaultWEBVPNGroup connection profile? DefaultWEBVPNGroup连接配置文件使用下面的哪一个默认的验证方案?
A.AAA (RADIUS)
B.AAA (TACACS+)
C.AAA (LOCAL)
D.AAA (LDAP)
E.None