单项选择题现有两个路由器ROUTER1和ROUTER2,ROUTER1在ROUTER2的密码是passRouter1,如何在路由器ROUTER2上给ROUTER1和ROUTER2进行PPP验证设置用户名和密码?()
A.Username Router1password PassRouter1
B.Username Router2password PassRouter1
C.Username Router1password PassRouter2
D.Username Router2password PassRouter2